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Luminescence of manganese ions in yttrium aluminium borate / Aleksandrovsky A.S., Gudim I.A., Krylov A.S, Temerov V.E. // 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, Lyon, 2008, p.482

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Gudim, I. A.; Гудим, Ирина, Анатольевна; Krylov, A. S; Temerov, V. E.
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Optical absorption and luminescence of Tm3+ and Yb3+ ions in huntite structure / Malakhovskii A.V., Edelman I.S., Sokolov A.E., Sukhachov A.L., Temerov V.L., Gnatchenko S.L., Kachur I.S., Piryatinskaya V.G., Valiev U.V. // Республиканская конференция «Оптические методы в современной физике», Ташкент, Узбекистан, 2008, с. 33-35

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Valiev, U. V.
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Solid solution structural engineering enhances the luminescence of SrMgAl10O17:Cr3+ for agricultural lighting / Y. Ma, W. Liao, B. Quan [et al.] // J. Lumin. - 2024. - Vol. 270. - Ст. 120553, DOI 10.1016/j.jlumin.2024.120553. - Cited References: 46. - The authors would like to gratefully acknowledge funds from the Key R & D Projects in Hunan Province (2021SK2047, 2022NK2044), the Wangcheng Science and Technology Plan (KJ221017), the Science and Technology Innovation Program of Hunan Province (2022WZ1022). The work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the World-class Research Center program: ‘‘Advanced Digital Technologies’’, contract no. 075-15-2020-935. Research Foundation of Education Bureau of Hunan Province, China (22B0211) . - ISSN 0022-2313. - ISSN 1872-7883
Кл.слова (ненормированные):
Optical material -- Indoor plant cultivation -- Far-red light -- SrMgAlO
Аннотация: Lead-free non-rare earth oxide phosphors have attracted wide attention due to their environmental protection, sustainability, and potential to replace halides and fluorides in the field of plant lighting. Among them, the Cr3+-excited aluminate phosphor exhibits high brightness, high thermal stability, and far red to near-infrared (NIR) emission due to the influence of the crystal field strength (CFS). This property gives rise to a variety of strategies used to modulate the CFS, for example, single ion substitution, chemical unit co-substitution, etc. Here, we chose the substitution of a single ion, with [BaO6] gradually replacing [SrO6] to form a solid solution. Their structural characteristics and the local structure of Cr3+ are studied and discussed. The device is packaged to evaluate the feasibility of the material for practical application. The prepared phosphor had a bright far-red light emission of 693 nm under blue light excitation, and this spectrum strongly matched the absorption of plant phytochrome PFR. This work provides the design principle of far red light emission activated by Cr3+ aluminate solid solution, which can inspire further research on pc-LED lights for plant lighting.

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Держатели документа:
School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, PR China
Hunan Optical Agriculture Engineering Technology Research Center, Changsha 410128, PR China
World-Class Research Center “Advanced Digital Technologies”, University of Tyumen, Tyumen 625003, Russia
Dongguan Ledstar Optoelectronics Technology Co., Ltd, Dongguan, 523000, PR China

Доп.точки доступа:
Ma, Y.; Liao, W.; Quan, B.; Kong, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zolotov, A.; Cheng, M.; Chen, X.; Zhou, Zh.; Xia, M.
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    Solid state synthesis, structural, DFT and spectroscopic analysis of EuAl3(BO3)4 / A. S. Oreshonkov, A. S. Aleksandrovsky, O. D. Chimitova [et al.] // Mater. Chem. Phys. - 2024. - Vol. 320. - Ст. 129400, DOI 10.1016/j.matchemphys.2024.129400. - Cited References: 55. - The work was carried out within the state assignment No FWES-2024-0003 of Kirensky Institute of Physics. This work was partially supported by the state order of BINM SB RAS (0273-2021-0008). The samples for this research were synthesized using equipment of the CCU BINM SB RAS. The reflectance spectrum was obtained at the Center for Optical and Laser Materials Research of Research park of St. Petersburg State University. The SEM measurements were performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" . - ISSN 0254-0584. - ISSN 1879-3312
   Перевод заглавия: Твердофазный синтез, структурный, квантово-химический (DFT) и спектроскопический анализ EuAl3(BO3)4
Кл.слова (ненормированные):
EuAl(BO) -- Huntite -- X-ray diffraction -- SEM -- DFT -- Charge transfer -- Raman -- Infrared -- Luminescence
Аннотация: Huntite-like borates are versatile and promising materials with wide range of applications in frequency conversion, UV light generation, lighting, displays, quantum information storage, and more, demonstrated by their various properties and uses in scientific research. In this work, EuAl3(BO3)4 powder was prepared through multi-stage solid-state reaction method using high-purity starting reagents: Eu2O3, Al2O3 and H3BO3, considering a 20 wt% excess of H3BO3 to compensate for B2O3 volatilization. Obtained samples undergo several treatments at varying temperatures and their phase purity is subsequently verified through powder X-ray diffraction analysis. The scanning electron microscopy reveals that resulting EuAl3(BO3)4 powder consists of granules exhibiting irregular morphologies with dimensions of 0.5–8 μm. The electronic band structure of EuAl3(BO3)4, calculated using the GGA PBE method, reveals f-states of Eu near 4 eV. These states do not produce emphasized peaks on simulated absorbance spectra. Using of DFT + U for the f-states of Eu pushed up f-bands above 6 eV and the charge transfer from p-O to d-Eu was obtained (Egdirect = 5.63 eV, Egindirect = 5.37 eV using Ueff = 4 eV). The variation of Ueff has a weak influence on the position of the bottom of the conduction band. The experimental bandgaps of EuAl3(BO3)4 crystalline powder, both direct and indirect, are found to be 3.96 and 3.67 eV, correspondingly. These values are lower than theoretical values what is associated with limitations of DFT calculations involving f electrons. The Raman spectrum of EuAl3(BO3)4 powder is discussed, detailing the contributions of different ions to specific spectral bands. Investigation of high-resolution luminescence spectra shows the possibility to estimate the content of defects by the testing the violation of the prohibition of ultranarrow 5D0 → 7F0 line that is forbidden in the ideal crystalline structure of trigonal EuAl3(BO3)4.

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Держатели документа:
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk, 660041, Russia
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russia
Laboratory of Oxide Systems, Baikal Institute of Nature Management, SB RAS, Ulan-Ude, 670047, Russia
Center for Optical and Laser Materials Research, Saint-Petersburg State University, Saint-Petersburg, 199034, Russia
Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, Moscow, 119334, Russia
Plekhanov Russian University of Economics, Moscow, 117997, Russia
Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
School of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russia
Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Department of Molecular Electronics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russia
Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, 660041, Russia

Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Chimitova, O.D.; Pankin, D.V.; Popov, Z.I.; Sukhanova, E.V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Adichtchev, S.V.; Pugachev, A.M.; Nemtsev, I. V.; Немцев, Иван Васильевич
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Near-unity PLQY and high anti-thermal quenching red luminescence from one-dimensional hybrid manganese chloride for efficient and stable white light-emitting diodes / B. Su, M. S. Molokeev, R. Chen, T. Zhang // J. Mater. Chem. C. - 2024, DOI 10.1039/D4TC01477D. - Cited References: 46 . - Article in press. - ISSN 2050-7526. - ISSN 2050-7534
Аннотация: The discovery of novel Mn2+-based metal halides with excellent luminescence properties and thermostability is particularly of great importance for solid-state lighting (SSL). Herein, a novel one-dimensional hybrid manganese chloride (TMA)MnCl3 of a hexagonal system with a P63/m space group is synthesized via a simple saturation crystallization method. Under 443 nm excitation, (TMA)MnCl3 single crystals exhibit a strong broad-band red emission peak at 645 nm originating from the 4T1 → 6A1 transition of Mn2+ ions with a full width at half maximum of 99 nm and a photoluminescence quantum yield (PLQY) of 98.6%. Moreover, (TMA)MnCl3 shows a high anti-thermal quenching behavior, and the integrated PL intensity still retains 100% of the initial intensity measured at 300 °C, caused by the high structural rigidity. Benefiting from its strong blue light excitation, high PLQY, and excellent thermal stability, a stable white light-emitting diode device is fabricated by combining a 465 nm blue LED chip, green-emitting Lu3Al5O12:Ce3+ and the (TMA)MnCl3 red phosphor with a high color rendering index of 94.3% and a correlated color temperature of 3995 K. This work develops a novel hybrid manganese chloride red-emitter and paves a new path to explore high-performance phosphors excited by blue light for SSL.

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Держатели документа:
School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, Shaanxi, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk 660041, Russia
Research and Development Department, Kemerovo State University, Kemerovo, Russia

Доп.точки доступа:
Su, B.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, R.; Zhang, T.
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    Unveiling temperature-induced structural phase transition and luminescence in Mn2+-doped Cs2NaBiCl6 double perovskite / S. Banerjee, S. Saikia, M. S. Molokeev, A. Nag // Chem. Mater. - 2024. - Vol. 36, Is. 9. - P. 4750-4757, DOI 10.1021/acs.chemmater.4c00514. - Cited References: 49. - Authors acknowledge Dr. Arup Rath’s lab NCL Pune and SAIF-IIT Bombay for diffuse reflectance spectroscopy and ICP-AES measurements, respectively. A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of the Department of Science and Technology, India. Authors acknowledge the Department of Science and Technology India (FIST program, SR/FST/CS-II/2019/105) for temperature-dependent powder XRD and EPR data. S.B. is grateful to IISER Pune for a research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India. M.M. acknowledges the Russian Science Foundation, grant 24-43-00006 . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Обнаружение температурно-индуцированного структурного фазового перехода и люминесценции в двойном перовските Cs2NaBiCl6, легированном Mn2+
Аннотация: Halide double perovskites like Cs2NaBiCl6 are good host materials for luminescent dopants like Mn2+. The nature of photoluminescence (PL) depends on the local structure around the dopant ion, and doping may sometimes influence the global structure of the host. Here, we unveil the correlation between the temperature-induced (global) structural phase transition of Mn2+-doped Cs2NaBiCl6 with the local structure and PL of the Mn2+ dopant. X-ray diffraction analysis shows Mn2+-doped Cs2NaBiCl6 is in a cubic (Fm3m) phase between 300 and 110 K, below which the phase changes to tetragonal (I4/mmm), which persists at least until 15 K. The small (∼1%) doping amount does not alter the phase transition behavior of Cs2NaBiCl6. Importantly, the phase transition does not influence the Mn2+ d-electron PL. The PL peak energy, intensity, spectral width, and lifetime do not show any signature of the phase transition between 300–6 K. The hyperfine splitting in temperature-dependent electron paramagnetic spectra of Mn2+ ions also remain unchanged across the phase transition. These results suggest that the global structural phase transition of the host does not influence the local structure and emission property of the dopant Mn2+ ion. This structure–property insight might be explored for other transition-metal- and lanthanide-doped halide double perovskites as well. The stability of dopant emission regardless of the structural phase transition bodes well for their potential applications in phosphor-converted light emitting diodes.

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Держатели документа:
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk, 660041 Russia

Доп.точки доступа:
Banerjee, S.; Saikia, S.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Nag, A.
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Temperature/component-dependent luminescence in lead-free hybrid metal halides for temperature sensor and anti-counterfeiting / G. Zhou, Y. Wang, Y. Mao [et al.] // Adv. Funct. Mater. - 2024. - Ст. 2401860, DOI 10.1002/adfm.202401860. - Cited References: 89. - G.J.Z. and Y.T.W. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (No.52202177, 22271211), Fundamental Research Program of Shanxi Province (No.20210302124054), Science and Technology Innovation Project of Colleges and Universities in Shanxi Province (No.2021L262), 1331 Project of Shanxi Province, Postgraduate Innovation Project of Shanxi Province (No.2023KY462), and supported by the Ministry of Science and High Education of Russian Federation (No.FSRZ-2023-0006). The authors would like to thank Prof. Haijun Jiao, Leibniz-Institut für Katalyse e.V., Germany, for the theoretical support on the electron-transition mechanism . - Article in press. - ISSN 1616-301X. - ISSN 1616-3028
Кл.слова (ненормированные):
electron-transition -- hybrid metal halides -- optical-functional applications -- self-trapped excitons -- tunable photoluminescence
Аннотация: Hybrid metal halides (HMHs) have emerged as a promising platform for optically functional crystalline materials, but it is extremely challenging to thoroughly elucidate the electron transition coupled to additional ligand emission. Herein, to discover sequences of lead-free HMHs with distinct optically active metal cations are aimed, that is, Sb3+ (5s2) with the lone-pair electron configuration and In3+ (4d10) with the fully-filled electron configuration. (Me2NH2)4MCl6·Cl (Me = −CH3, M = Sb, In) exhibits the superior temperature/component-dependent luminescence behaviors resulting from the competition transition between triplet-states (Tn-S0) self-trapped excitons (STEs) of inorganic units and singlet-state (S1-S0) of organic cations, which is manipulated by the optical activity levels of [SbCl6]3− and [InCl6]3−. The bonding differences between Sb3+/In3+ and Cl− in terms of electronic excitation and hybridization are emphasized, and the different electron-transition mechanisms are established according to the PL spectra at the extreme temperature of 5 to 305 K and theoretical calculations. By fine-tuning the B-site Sb3+/In3+ alloying, the photoluminescence quantum yield (PLQY = 81.5%) and stability are optimized at 20% alloying of Sb3+. This research sheds light on the rules governing PL behaviors of HMHs, as well as exploring the optical-functional application of aviation temperature sensors and access-control systems.

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Держатели документа:
Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan 030031, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, Krasnoyarsk 660041, Russia
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, P. R. China
College of Chemistry & Chemical Engineering, Key Laboratory of Interface Science and Engineering in Advanced Material, Ministry of Education, Taiyuan University of Technology, Taiyuan, Shanxi 030024, P. R. China

Доп.точки доступа:
Zhou, G.; Wang, Y.; Mao, Y.; Guo, C.; Zhang, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Zhang, X.-M.
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    Modulation of Bi3+ luminescence from broadband green to broadband deep red in Lu2WO6 by Gd3+ doping and its applications in high color rendering index white LED and near-infrared LED / X. Wang, X. Feng, M. S. Molokeev [и др.] // Dalton Trans. - 2023. - Vol. 52, Is. 9. - P. 2619-2630, DOI 10.1039/D2DT03751C. - Cited References: 4. - This work is supported in part by the Project of Education Department of Liaoning Province (Grant No. LQ2019014) and he Natural Science Foundation of Liaoning Province (Grant No. 2020-MS-286). The authors are thankful for the support for the 4B9A Beamline from the Beijing Synchrotron Radiation Facility (BSRF) (Project No. 2021-BEPC-PT-005290). The authors would like to thank Siqi Liu from Shiyanjia Lab ( . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Модуляция люминесценции Bi3+ от широкополосного зеленого до широкополосного темно-красного в Lu2WO6 с помощью легирования Gd3+ и его применение в белых светодиодах с высоким индексом цветопередачи и светодиодах ближнего инфракрасного диапазона
Аннотация: Phosphors that exhibit tunable broadband emissions are highly desired in multi-functional LEDs, including pc-WLEDs and pc-NIR LEDs. In this work, broadband emissions were obtained and modulated in the unexpectedly wide spectral range of 517–609 nm for (Lu0.99−xGdxBi0.01)2WO6 phosphors by tuning the Gd3+ content (x = 0–0.99). The effects of Gd3+ doping on phase constituents, particle morphology, crystal structure, and photoluminescence were systematically investigated. Broadband green emission was obtained from Gd3+-free (Lu0.99Bi0.01)2WO6 phosphors (x = 0), whose emission intensity was enhanced by 50% with 5 at% Gd3+ (x = 0.05). The phase transition happened when x 0.50 and the broadband red-NIR emission was obtained when x = 0.75–0.99. Three luminescence centers were proved to be responsible for the broadband green emissions via crystal structure, spectral fitting and fluorescence decay analysis. A pc-WLED with a high color rendering index (Ra = 91.3), a stable emission color, and a low color temperature (3951 K) was fabricated from the (Lu0.94Gd0.05Bi0.01)2WO6 broadband green phosphor, and an LED device that simultaneously emits high color rendering index white light and NIR light was obtained with the (Gd0.99Bi0.01)2WO6 broadband red-NIR phosphor. Night vision and noninvasive imaging were also demonstrated using the latter LED device.

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Держатели документа:
College of Chemistry and Materials Engineering, Bohai University, Jinzhou, Liaoning 121007, China
Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Laboratory of Crystal Physics, Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk 660036, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
Siberian Federal University, Krasnoyarsk 660041, Russia
Jilin Engineering Laboratory for Quantum Information Technology, Institute for Interdisciplinary Quantum Information Technology, Jilin Engineering Normal University, Changchun 130052, China

Доп.точки доступа:
Wang, Xuejiao; Feng, Xiaowen; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zheng, Huiling; Wang, Qiushi; Xu, Chunyan; Li, Ji-Guang
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    Double-site occupation triggered broadband and tunable NIR-I and NIR-II luminescence in AlNbO4:Cr3+ phosphors / K. Lyu, G. Liu, M. S. Molokeev, Z. Xia // Adv. Phys. Res. - 2023. - Vol. 2, Is. 4. - Ст. 2200056, DOI 10.1002/apxr.202200056. - Cited References: 38. - This research was supported by the International Cooperation Project of the National Key Research and Development Program of China (2021YFB3500400 and 2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118), Guangzhou Science & Technology Project (202007020005), the State Key Laboratory of Luminescent Materials and Devices (Skllmd-2022-02), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01×137). This work was also funded by RFBR according to the research project No. 19-52-80003 . - ISSN 2751-1200
   Перевод заглавия: Широкополосная и перестраиваемая люминесценция NIR-I и NIR-II в люминофорах AlNbO4:Cr3+, запускаемая заселением двух позиций в кристалле
Кл.слова (ненормированные):
near-infrared luminescence -- phosphor -- site occupation -- tunable emissions
Аннотация: Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr3+-doped AlNbO4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr3+ emitters in different Al3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO4:Cr3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr3+-doped AlNbO4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.

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The State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering South China University of Technology, Guangzhou 510641, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk 660041, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, P. R. China

Доп.точки доступа:
Lyu, Kuangnan; Liu, Gaochao; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo
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10.

    Engineering charge-transfer interactions for red-emitting SrLa(Sc,Ga)O4:Ce3+ phosphor with improved thermal stability / Z. Yang, Y. Zhao, J. Ueda [et al.] // Sci. China Mater. - 2023. - Vol. 66, Is. 5. - P. 1989-1996, DOI 10.1007/s40843-022-2315-9. - Cited References: 32. - This work was supported by the National Key Research and Development Program of China (2021YFE0105700), the National Natural Science Foundations of China (51972118), the Natural Science Foundation of Shandong Province (ZR2021ZD10 and ZR2018JL016), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work was also funded by Russian Foundation for Basic Research (19-52-80003) . - ISSN 2095-8226. - ISSN 2199-4501
   Перевод заглавия: Формирование взаимодействия с переносом заряда для люминофора SrLa(Sc,Ga)O4:Ce3+ с красным излучением и улучшенной термической стабильностью
Кл.слова (ненормированные):
Ce3+ -- thermal stability -- band gap -- broadband red luminescence
Аннотация: Blue-light-excitable red-emitting phosphors with high thermal stability are essential for fabricating white light-emitting diodes (WLEDs). Herein, Ce3+-doped SrLaScO4 (SLO:Ce3+) phosphor is discovered to have an abnormal red emission band centered at 640 nm when excited at 440 nm. Spectroscopy and structural analyses confirm that Ce3+ ions occupy the [LaO8] polyhedrons competitively, generating a strong crystal field splitting and a large Stokes shift to produce a red emission. To further restrict the thermal quenching of SLO:Ce3+, charge-transfer engineering is implemented by incorporating a large electronegative Ga3+ in the Sc3+ site, which can attract more charges from nearby coordinating groups to decrease the electronic occupation at the bottom of the conduction band and thereby enlarge the band gap. Sc/Ga substitution in SrLa(Sc,Ga)O4:Ce3+ enhances the thermal stability by increasing the intensity ratio from 15% to 31% at 150°C compared with 20°C. This is attributed to the efficient suppression of the thermally stimulated ionization process. This study presents a general design principle for discovering novel Ce3+-doped red phosphors with good thermal stability for WLED applications.

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State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Centre of Special Optical Fibre Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, 999077, China
Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), Nomi, Ishikawa, 923-1292, Japan
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Department of Engineering Physics and Radioelectronic, Siberian Federal University, Krasnoyarsk, 660041, Russia
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russia
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641, China

Доп.точки доступа:
Yang, Zhiyu; Zhao, Yifei; Ueda, Jumpei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Shang, Mengmeng; Xia, Zhiguo
}
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11.

    Chemical group substitution enables highly efficient Mn4+ luminescence in heterovalent systems / H. Ming, Y. Zhao, Y. Zhou [et al.] // Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст. 2300076, DOI 10.1002/adom.202300076. - Cited References: 36. - This work was financially supported by the National Key Research and Development Program of China (2022YFB3503800), the National Science Foundation of China (Grant Nos. 52202170 and 51972117). This work was also funded by RFBR according to the research project No. 19-52-80003 . - ISSN 2195-1071
   Перевод заглавия: Замена химической группы обеспечивает высокоэффективную люминесценцию Mn4+ в гетеровалентных системах
Кл.слова (ненормированные):
defects -- heterovalent substitution -- Mn4+ -- oxyfluoride -- phosphors
Аннотация: Defects are a double-edged sword for heterovalent metal-ion doping phosphors. Along with the luminescence tunability of phosphors bestowed by defects, their expected luminescence efficiency would also be inevitably lowered due to the presence of these quenching sites. Herein, a chemical group substitution strategy is proposed, where inorganic polyhedrons act as the smallest chemical units during the structural evolution of the doping process. Such a method can not only effectively prevent the defect generation for charge compensation in heterovalent doping systems, but also facilitate the incorporation of activators into the matrix, leading to extremely high luminescence efficiency. The concept is first confirmed energetically favorable by first-principles simulations. As a robust experimental proof, two newly reported Mn4+-incorporated hexavalent organic-inorganic hybrid oxyfluorides (TMA)2BO2F4:Mn4+ (where TMA stands for tetramethylammonium, and B = W6+ or Mo6+) present high quantum efficiency (up to 94.4%) and short lifetime (down to 2.26 ms) that are superior to the commercial red phosphor K2SiF6:Mn4+ (≈84.8%, ≈8.06 ms). Utilizing the differences in decay lifetimes and thermal quenching behaviors of (TMA)2BO2F4:Mn4+ and K2SiF6:Mn4+, a time- and temperature-resolved single-color multiplexing mode with high-safety and easy-access is developed for information security. This work offers an effective strategy to manipulate defect generation in luminescent materials.

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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, and Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, South China University of Technology, Guangzhou, 510641 P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036 Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660041 Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021 Russia
School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510641 P. R. China

Доп.точки доступа:
Ming, Hong; Zhao, Yifei; Zhou, Yayun; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wang, Yuanjing; Song, Enhai; Zhang, Qinyuan
}
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12.

    Luminescent studies of flexible [DUT-8 (Zn)] metal-organic frameworks / N. V. Slyusarenko, A. S. Krylov, M. V. Timofeeva [et al.] // Proc. SPIE. - 2023. - Vol. 12920: XVI International Conference on Pulsed Lasers and Laser Applications (10-15 September 2023, Tomsk, Russian Federation). - Ст. 1292014, DOI 10.1117/12.3005774. - Cited References: 10. - The reported study was funded by RFBR and DFG, project 21-52-12018
   Перевод заглавия: Изучение люминесценции гибкого DUT-8 (Zn) металлоорганического каркасного соединения
Кл.слова (ненормированные):
Förster resonance energy transfer -- FRET -- DUT-8 (Zn) -- metal-organic frameworks -- dye -- energy transfer -- efficiency -- steady-state luminescence -- time-resolved luminescence
Аннотация: An approach to the study of the porous structure of metal-organic frameworks (MOF) using guest luminescent molecules with specially selected spectral characteristics as acceptors of electronic excitation energy was suggested. If such molecules are adsorbed in MOF pores with sizes comparable to the Förster radius, Förster resonance energy transfer (FRET) from photoexcited linkers occurs. In this case quenching of luminescence of the linker can serve as analytical signals indicating open pore structure of the MOF. The developed approach was demonstrated by the example of DUT-8(Zn) MOF and Coumarin 1 as guest molecules by time-resolved luminescence methods.

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Держатели документа:
Siberian Federal University, Svobodny Prospect 79, 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics FRC KSC SB RAS, Academgorodok 50/38, 660036, Krasnoyarsk, Russia
ITMO University, School of Physics and Engineering, Kronverksky Prospekt 49, bldg. A, 197101, St. Petersburg, Russia

Доп.точки доступа:
Slyusarenko, N. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Timofeeva, M. V.; Shipilovskikh, S. A.; Slyusareva, E. A.; International Conference on Pulsed Lasers and Laser Applications(16 ; 2023 : 10-15 Sept. ; Tomsk, Russian Federation)
}
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13.

Effect of complexation with closo-decaborate anion on photophysical properties of copolyfluorenes containing dicyanophenanthrene units in the main chain / A. A. Yakimanskiy, K. I. Kaskevich, T. G. Chulkova [et al.] // Micro. - 2023. - Vol. 3, Is. 4. - P. 930-940, DOI 10.3390/micro3040063. - Cited References: 23. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060 . - ISSN 2673-8023
Кл.слова (ненормированные):
CAM-B3LYP -- charge transfer -- copolyfluorene -- energy transfer -- hole-electron distribution -- nitrilium derivatives of closo-decaborate anions -- lambda-diagnostic -- luminescence -- phenanthrene-9,10-dicarbonitrile -- TD-DFT
Аннотация: The functionalization of copolyfluorenes containing dicyanophenanthrene units by closo-decaborate anion is described. Target copolyfluorenes were analyzed using SEM, UV-vis, luminescence, NMR, and Fourier-transform infrared (FTIR) spectroscopy. The effect of complexation with the closo-decaborate anion on the photophysical properties was studied both experimentally and theoretically. The PL data indicate an efficient charge transfer from fluorene to the dicyanophenanthrene units coordinated to the closo-decaborate. The coordination of closo-decaborate clusters to the nitrile groups of copolyfluorenes provides an important route to new materials for sensors and light-emitting devices while, at the same time, serving as a platform for further study of the nature of boron clusters.

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Держатели документа:
Institute of Macromolecular Compounds, RAS, Bolshoi Prospect of Vasilyevsky Island 31, Saint Petersburg 199004, Russia
Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
Kurnakov Institute of General and Inorganic Chemistry, RAS, Moscow 119991, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory for Digital Controlled Drugs and Theranostics, Federal Research Center KSC SB RAS, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Yakimanskiy, Anton A.; Kaskevich, Ksenia I.; Chulkova, Tatiana G.; Krasnopeeva, Elena L.; Savilov, Serguei V.; Voinova, Vera V.; Neumolotov, Nikolay K.; Zhdanov, Andrey P.; Rogova, Anastasia V.; Рогова, Анастасия Владимировна; Tomilin, F. N.; Томилин, Феликс Николаевич; Zhizhin, Konstantin Yu.; Yakimansky, Alexander V.
}
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14.

    Abnormal Bi3+ activated NIR phosphor toward multifunctional LED applications / Y. Li, S. Gai, H. Zhu [et al.] // Ceram. Int. - 2023. - Vol. 49, Is. 23, Pt. B. - P. 39671-39680, DOI 10.1016/j.ceramint.2023.09.322. - Cited References: 45. - This research was jointly supported by the National Natural Science Foundation of China (Grant No. 51974123 ), the Key R & D Projects in Hunan Province ( 2021SK2047 , 2022NK2044 ), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261 ), Wangcheng Science and Technology Plan ( KJ221017 ), the Science and Technology Innovation Program of Hunan Province ( 2022WZ1022 ) and the Strategic Academic Leadership Program “Priority-2030” for the Siberian Federal University . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Аномальный Bi3+-активированный БИК-люминофор для применения в многофункциональных светодиодах
Кл.слова (ненормированные):
Phosphor -- Luminescence -- Bi3+ -- NIR emission
Аннотация: Herein, the strategy of replacing Ge4+ with smaller Si4+ was adopted to realize the site-selective occupation of Bi3+ activator in the small ring and obtain a near-infrared light-emitting in Zn2(Ge,Si)O4. The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift (εc) and crystal field splitting (εcfs). This work not only provides new insights for the development of Bi3+-activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi3+.

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Держатели документа:
College of Bioscience and Biotechnology, Hunan Agricultural University, Hunan, Changsha, 410128, China
Hunan Provincial Engineering Technology Research Center for Optical Agriculture, Hunan Agricultural University, Changsha, 410128, China
School of Materials Science and Engineering, Hunan Agricultural University, Hunan, Changsha, 410128, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Li, Y.; Gai, S.; Zhu, H.; Yin, J.; Guo, W.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lu, X.; Xia, M.; Zhou, Z.
}
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15.

Synthesis, photo- and electroluminescence of new polyfluorene copolymers containing dicyanostilbene and 9,10-dicyanophenanthrene in the main chain / A. A. Yakimanskiy, K. I. Kaskevich, E. V. Zhukova [et al.] // Materials. - 2023. - Vol. 16, Is. 16. - Ст. 5592, DOI 10.3390/ma16165592. - Cited References: 25. - This work was supported by the Russian Science Foundation, grant no. 23-43-00060 . - ISSN 1996-1944
Кл.слова (ненормированные):
copolyfluorene -- phenanthrene-9,10-dicarbonitrile -- α,α′-dicyanostilbene -- luminescence -- OLEDs
Аннотация: Using palladium-catalyzed Suzuki polycondensation, we synthesized new light-emitting fluorene copolymers containing the dicyano derivatives of stilbene and phenanthrene and characterized them by gel permeation chromatography, UV-vis absorption spectroscopy, spectrofluorimetry, and cyclic voltammetry. The photoluminescence spectra of the synthesized polymers show significant energy transfer from the fluorene segments to the dicyanostilbene and 9,10-dicyanophenanthrene units, which is in agreement with the data of theoretical calculations. OLEDs based on these polymers were fabricated with an ITO/PEDOT-PSS (35 nm)/p-TPD (30 nm)/PVK (5 nm)/light emitting layer (70–75 nm)/PF-PO (20 nm)/LiF (1 nm)/Al (80 nm) configuration. Examination of their electroluminescence revealed that copolymers of fluorene with dicyanostilbene show yellow-green luminescence, while polymers with 9,10-dicyanophenanthrene have a greenish-blue emission. The 9,10-dicyanophenanthrene units have a more rigid structure compared to dicyanostilbene and, in OLEDs based on them, an increase in maximum brightness is observed with an increase in the content of the additive to the polymer chain. In particular, the device using fluorene copolymer with 9,10-dicyanophenanthrene (2.5 mol%) exhibited a maximum brightness of 9230 cd/m2 and a maximum current efficiency of 3.33 cd/A.

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Держатели документа:
Institute of Macromolecular Compounds RAS, Bolshoi Prospect of Vasilyevsky Island 31, St. Petersburg, 199004, Russian Federation
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskiy Prospect 31, bld.4, Moscow, 119071, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
School of Non-Ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Yakimanskiy, A. A.; Kaskevich, K. I.; Zhukova, E. V.; Berezin, I. A.; Litvinova, L. S.; Chulkova, T. G.; Lypenko, D. A.; Dmitriev, A. V.; Pozin, S. I.; Nekrasova, N. V.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ivanova, D. A.; Yakimansky, A. V.
}
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16.

Raman scattering, absorption and luminescence spectroscopy of CoSiF6·6H2O crystal and CoSiF6·6H2O:Mn4+ red-emitting phosphor / Y. V. Gerasimova, A. S. Aleksandrovsky, N. M. Laptash [et al.] // Opt. Mater. - 2023. - Vol. 144. - Ст. 114343, DOI 10.1016/j.optmat.2023.114343. - Cited References: 30. - The reported study was funded by Russian Science Foundation , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project ‘‘Synthesis, spectral and magnetic properties of ABF6·6H2O systems, new materials for photonics.” No. 23-22-10037 . https://rscf.ru/en/project/23-22-10037/ . Usage of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS is acknowledged. We thank A. Yu. Mamaev for recording the luminesce spectra of CoSiF6·6H2O:Mn 4+ . - ISSN 0925-3467. - ISSN 1873-1252
Кл.слова (ненормированные):
Phase transition -- Dynamics -- Raman -- Electronic excitations -- Luminescence -- Tanabe-Sugano
Аннотация: CoSiF6·6H2O and CoSiF6·6H2O:Mn4+ crystals were investigated by means of Raman, optical absorption, and luminescence spectroscopy. Absorption spectra of CoSiF6·6H2O are analyzed by Tanabe-Sugano technique and are proved to be well-describable at crystal field strength Dq = 1000 cm−1, and Racah parameters B = 896 cm−1, C = 4408 cm−1, Dq/B = 1.116. Raman spectroscopy reveals a phase transition associated with the ordering of both the CoO6 and SiF6 octahedra, which occurs through the ordering of the H2O subsystem. Luminescence spectrum of Mn4+ ions in CoSiF6·6H2O lattice consists of six components corresponding to Stokes and anti-Stokes emission from 2E state of Mn4+ ion at vibrational frequencies of MnF6 octahedron ν6 = 230 cm−1, ν4 = 335 cm−1, and ν3 = 645 cm−1. Quantum efficiency of red emission maximizes at excitation wavelength 357 nm and equals to 5%. Decrease of quantum efficiency in comparison to other related materials is explained by absorption of Co2+ ions and non-radiative relaxation in the Co2+ subsystem.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Laptash, N. M.; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimov, M. A.; Герасимов, Максим Алексеевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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17.

    Competitive site occupation toward improved quantum efficiency of SrLaScO4:Eu red phosphors for warm white LEDs / Z. Y. Yang, G. C. Liu, Y. F. Zhao [et al.] // Adv. Opt. Mater. - 2022. - Vol. 10. Is. 6. - Ст. 2102373, DOI 10.1002/adom.202102373. - Cited References: 42. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (Program No. 2021YFE0105700), National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), Guangzhou Science & Technology Project (Project No. 202007020005), the State Key Laboratory of Luminescent Materials and Devices (Grant No. Skllmd-2021-09), China Postdoctoral Science Foundation (Grant No. 2021M691053), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Program No. 2017BT01X137). This work was also funded by RFBR according to the research Project No. 19-52-80003 and the NRF International: SA/China Joint Research Programme 2021 - CHIN2002265 06921 UID 132785 . - ISSN 2195-1071
   Перевод заглавия: Конкурентное заселение позиций для повышения квантовой эффективности красных люминофоров SrLaScO4:Eu для тепло-белых светодиодов

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LUMINESCENCE
   EUROPIUM
   BLUE
   EU2+
   STABILIZATION
   EPR
Кл.слова (ненормированные):
light-emitting diodes -- photoluminescence -- red emission
Аннотация: The discovery of Eu2+-doped high-efficiency red phosphors remains a vital challenge for white light-emitting diode (WLED) applications. It is therefore urgent to find effective strategies managing the oxidation state to help reduce Eu3+ to Eu2+ and accordingly increase the photoluminescence quantum yield (PLQY). Herein, a new red-emitting SrLaScO4:Eu phosphor is designed, and the PLQY is enhanced from 13% to 67% under 450 nm excitation by employing (NH4)2SO4-assisted sintering. Combined structural analysis, optical spectroscopy, and theoretical calculation reveal that predominant Eu2+ prefers to occupy the Sr2+ sites in the SrLaScO4 enabling red emission, and a competitive site occupation of Eu3+ in La3+ can be restrained, and the reduction mechanism of Eu3+ to Eu2+ originating from the (NH4)2SO4 addition is analyzed. The fabricated WLED device using red-emitting SrLaScO4:Eu and yellow-emitting Y3(Al,Ga)5O12:Ce3+ exhibits a high color-rendering index of 86.7 at a low correlated color temperature of 4005 K. This work provides a feasible reduction strategy for guiding the development of high-efficiency Eu2+-doped red phosphor for WLED applications.

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Держатели документа:
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.
City Univ Hong Kong, Dept Chem, Kowloon, Hong Kong 999077, Peoples R China.
KSC SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Univ Free State, Dept Phys, POB 339, ZA-9300 Bloemfontein, South Africa.
South China Univ Technol, Sch Phys & Optoelect, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Yang, Zhiyu; Liu, Gaochao; Zhao, Yifei; Zhou, Yayun; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Swart, Hendrik C.; Xia, Zhiguo; International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; State Key Laboratory of Luminescent Materials and Devices [Skllmd-2021-09]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2021M691053]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]; NRF International: SA/China Joint Research Programme 2021 [CHIN2002265 06921 UID 132785]
}
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18.

    Novel far-red phosphors (La, Gd, Y)2MgTiO6:Cr3+ with tunable luminescence spectra for grow light / P.-X. Gao, P. Dong, Z.-Y. Zhou [и др.] // Faguang Xuebao/Chin. J. Lumines. - 2022. - Vol. 43, Is. 1. - P. 58-68, DOI 10.37188/CJL.20210327. - Cited References: 27. - Supported by National Natural Science Foundation of China(51974123); The Distinguished Youth Foundation of Hunan Province(2020JJ2018); Key R & D Projects in Hunan Province(2020WK2016&2020SK2032&2022NK2044), Hunan High Level Talent Gathering Project(2019RS1077&2020RC5007); Natural Science Foundation of Hunan Province(2021JJ40261); The Scientific Research Fund of Hunan Provincial Education Department(19C0903); The Natural Sciences Foundation of Hunan Agricultural University(19QN11); Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation(19KFXM12); Changsha Science and Technology Plan(KH2005114) . - ISSN 1000-7032
   Перевод заглавия: Новые ИК люминофоры (La,Gd,Y)2MgTiO6:Cr3+ с настраиваемыми спектрами люминесценции для агроламп
Кл.слова (ненормированные):
phosphor -- double perovskite structure -- luminescence tuning performance -- far-red light -- Cr3+
Аннотация: Cr3+-activated double perovskite structure phosphor has drawn wide attention due to its far-red and near-infrared emission. In this work, we synthesized a series of (La,Gd,Y)2MgTiO6∶Cr3+ phosphors which can be excited by ultraviolet light of about 345 nm, and the emission bands are in the range of 700-900 nm. The spectra were tuned by ions substitution strategy. The main emission peaks were blue shifted from 766 nm to 737 nm and 757 nm by substituting the La site with Gd and Y, respectively. Meanwhile, the thermal stability at 150 ℃ increased from 41.7% to 69.1% and 67%, respectively. The crystal structure, microstructure, decay time, thermal stability and band gap were investigated systematically. The substitution of Gd/Y ions causes the lattice contraction, which results in the change of the nephelauxetic effect, and eventually leads to the blue shift of the spectra. The emission spectra of these phosphors have good matching with the 730 nm absorption peak of phytochrome FR(PFR), indicating their application prospect in plant growth lighting. Cationic substitution strategy can regulate the luminescence properties of Cr3+, which provides ideas for the development of phosphors for plant growth lamps in the future.

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Держатели документа:
Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization, Changsha, 410128, China
School of Chemistry and Materials Science, Hunan Agricultural University, Hunan Agricultural University, Changsha, 410128, China
Hunan Optical Agriculture Engineering Technology Research Center, Hunan Agricultural University, Changsha, 410128, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Gao, P. -X.; Dong, P.; Zhou, Z. -Y.; Zhang, X. -J.; Li, Y. -N.; Yang, J. -K.; Li, Q.; Chen, K.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhou, Z.; Xia, M.
}
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19.

    Europium (II) sulfate EuSO4: Synthesis methods, crystal and electronic structure, luminescence properties / Y. G. Denisenko, A. E. Sedykh, A. S. Oreshonkov [et al.] // Eur. J. Inorg. Chem. - 2022. - Vol. 2022, Is. 12. - Ст. e202200043, DOI 10.1002/ejic.202200043. - Cited References: 69. - This research is partially supported by the state order of BINM SB RAS (project no. 0273-2021-0008) . - ISSN 1434-1948. - ISSN 1099-0682
   Перевод заглавия: Сульфат европия (II) EuSO4: методы синтеза, кристаллическая и электронная структура, люминесцентные свойства

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
DEPENDENT DECAY BEHAVIOR
ELECTROCHEMICAL REDUCTION
OPTICAL-PROPERTIES
Кл.слова (ненормированные):
Europium -- Inorganic synthesis -- Luminescence -- Structure elucidation -- Sulfates
Аннотация: In the present work, we report on the synthesis of EuSO4 powders by two different methods using EuS as starting material. The compound EuSO4 contains divalent europium and crystallizes in the orthorhombic crystal system, space group Pnma with parameters close to SrSO4. The compound exhibits near isotropic thermal expansion over the temperature range 300–700 K. EuSO4 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. EuSO4 is found to be an indirect bandgap material with a bandgap close to direct electronic transition. The emission lifetime of divalent europium d-f emission in EuSO4 shows an unusual behavior for stoichiometric compounds, as it shortens upon cooling from 1.11(1) μs at room temperature to 0.44(1) μs at 77 K.

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Держатели документа:
Ind Univ Tyumen, Dept Gen & Special Chem, Tyumen 625000, Russia.
Justus Liebig Univ Giessen, Inst Inorgan & Analyt Chem, D-35392 Giessen, Germany.
Tyumen State Univ, Dept Inorgan & Phys Chem, Tyumen 625003, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Mol Spect, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Sch Engn & Construct, Krasnoyarsk 660041, Russia.
Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.
Northern Trans Ural Agr Univ, Res Dept, Tyumen 625003, Russia.
SB RAS, Baikal Inst Nat Management, Ulan Ude 670047, Russia.
UB RAS, Lab Chem Rare Earth Cpds, Inst Solid State Chem, Ekaterinburg 620137, Russia.
Justus Liebig Univ Giessen, Ctr Mat Res LaMa, Heinrich Buff Ring 16, D-35392 Giessen, Germany.

Доп.точки доступа:
Denisenko, Y. G.; Sedykh, A. E.; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Azarapin, N. O.; Sal'nikova, E. I.; Chimitova, O. D.; Andreev, O. V.; Razumkova, I. A.; Muller-Buschbaum, K.; [0273-2021-0008]
}
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20.

    Giant red-shifted emission in (Sr,Ba)Y2O4:Eu2+ phosphor toward broadband near-infrared luminescence / Z. Y. Yang, Y. F. Zhao, Y. Y. Zhou [et al.] // Adv. Funct. Mater. - 2022. - Vol. 32, Is. 1. - Ст. 2103927, DOI 10.1002/adfm.202103927. - Cited References: 60. - This research was supported by the International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), National Natural Science Foundations of China (Grant No. 51972118 and 51961145101), Guangzhou Science & Technology Project (202007020005), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-52-80003 . - ISSN 1616-301X. - ISSN 1616-3028
   Перевод заглавия: Излучение с гигантским красным смещением в люминофоре (Sr,Ba)Y2O4: Eu2 + для широкополосной люминесценции в ближней инфракрасной области

РУБ Chemistry, Multidisciplinary + Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
LIGHT-SOURCES
   PHOTOLUMINESCENCE
   TRANSITION
   CE3+
   BLUE
   SUBSTITUTION
Кл.слова (ненормированные):
near-infrared emission -- photoluminescence -- red emission
Аннотация: Near-infrared (NIR) light-emitting diodes (LEDs) light sources are desirable in photonic, optoelectronic, and biological applications. However, developing broadband red and NIR-emitting phosphors with good thermal stability is always a challenge. Herein, the synthesis of Eu2+-activated SrY2O4 red phosphor with high photoluminescence quantum efficiency and broad emission band ranging from 540 to 770 nm and peaking at 620 nm under 450 nm excitation is designed. Sr/Ba substitution in SrY2O4:Eu2+ has been further utilized to achieve tunable emission by modifying the local environment, which facilitates the giant red-shifted emission from 620 to 773 nm while maintaining the outstanding thermal stability of SrY2O4:Eu2+. The NIR emission is attributed to the enhanced Stokes shift and crystal field strength originated from the local structural distortions of [Y1/Eu1O6] and [Y2/Eu2O6]. The investigation in charge distribution around Y/Eu provides additional insight into increasing covalency to tune the emission toward the NIR region. As-fabricated NIR phosphor-converted LEDs demonstration shows its potential in night-vision technologies. This study reveals the NIR luminescence mechanism of Eu2+ in oxide-based hosts and provides a design principle for exploiting Eu2+-doped NIR phosphors with good thermal stability.

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Держатели документа:
South China Univ Technol, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, State Key Lab Luminescent Mat & Devices, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.
Natl Synchrotron Radiat Res Ctr, Mat Sci Grp, Sci Res Div, Hsinchu 300, Taiwan.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia.

Доп.точки доступа:
Yang, Zhiyu; Zhao, Yifei; Zhou, Yayun; Qiao, Jianwei; Chuang, Yu-Chun; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Zhiguo; International Cooperation Project of National Key Research and Development Program of China [2021YFE0105700]; National Natural Science Foundations of ChinaNational Natural Science Foundation of China (NSFC) [51972118, 51961145101]; Guangzhou Science & Technology Project [202007020005]; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X137]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
}
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