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1.


   
    Zero-thermal-quenching broadband yellow-emitting Bi3+-activated phosphors based on metal to metal charge transfer / K. Chen, P. Gao, Z. Zhang [et al.] // J. Alloys Compd. - 2024. - Vol. 986. - Ст. 174112, DOI 10.1016/j.jallcom.2024.174112. - Cited References: 52. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Key R & D Projects in Hunan Province (2021SK2047 and 2022NK2044), the Wangcheng Science and Technology Plan (KJ221017) and 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 World-class Research Center program: "Advanced Digital Technologies", contract no. 075-15-2020-935. Superior Youth Project of the Science Research Project of Hunan Provincial Department of Education (22B0211) . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Bi3+-activated phosphors -- Yellow-emitting -- MMCT -- Zero-thermal-quenching -- WLED
Аннотация: Bi3+-activated phosphors have been proven to have potential applications foreground in white light-emitting diodes (WLED), plant growth lamps and temperature sensing. Therefore, it is urgent to exploit high-efficiency Bi3+-activated phosphors. Herein, a novel broadband yellow-emitting phosphor Ba2GdGaO5:Bi3+ with high internal quantum efficiency (IQE = 77%) was obtained based on metal to metal charge transfer (MMCT) between Bi3+ ground state and Gd3+ excited states. The photoluminescence excitation (PLE) spectrum and photoluminescence (PL) spectrum range from 225 nm to 400 nm and 400 nm to 700 nm, respectively, which can avoid the reabsorption phenomenon efficiently. Besides, Ba2GdGaO5:Bi3+ has superior thermal stability and it shows zero-thermal-quenching at 150 °C. The K+ doping hardly changes the thermal stability and can improve the PL intensity to 133.1% when the K+ concentration is 2%. Finally, a phosphor-convert WLED (pc-WLED) was simply synthesized by Ba2GdGaO5:Bi3+ and BaMgAl10O17:Eu2+ (BAM:Eu2+) phosphors. The doping of Eu3+ can significantly enhance the color rendering index (CRI, from 88.1 to 91.5) and reduce the correlated color temperature (CCT, from 4911 K to 4014 K). The above experimental results demonstrated that the phosphor has great application prospect in WLED.

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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

Доп.точки доступа:
Chen, K.; Gao, P.; Zhang, Z.; Ma, Y.; Luo, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhou, Zh.; Xia, M.
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2.


   
    Synergetic manipulation of components and multiple activator sites towards full-spectrum lighting in Eu2+-doped whitlockite phosphors for high color-rendering WLED / H. Chen, Z. Zhang, R. Mi [et al.] // J. Lumin. - 2024. - Vol. 275. - Ст. 120795, DOI 10.1016/j.jlumin.2024.120795. - Cited References: 47. - We acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52104272 and 52072348), the Young Elite Scientists Sponsorship Program by CAST (2024QNRC001) and the Program National Key R&D Program of China (2021YFC1910602-01) . - ISSN 0022-2313. - ISSN 1872-7883
   Перевод заглавия: Синергетическое манипулирование составом и множеством позиций активаторов для обеспечения широкоспектрального освещения в витлокитовых люминофорах, легированных Eu2+, для высокой цветопередачи белых светодиодов
Кл.слова (ненормированные):
Components regulation -- Multi-site occupancies -- Whitlockite phosphors -- Eu -- High color rendering
Аннотация: Tuning the components and multiple activator sites possesses profound significances on the regulation for corresponding luminescent properties of target phosphors. However, it is still challenging to realize full-visible emission via single activator in a single phase owing to the matrix diversity and uncertainty for multi-site occupation. Herein, we developed a family of whitlockite-type solid-solution phosphors Ca8MgGa1-yLay(PO4)7: Eu2+(y = 0–1) via inducing the La3+ ions into Ca8MgGa(PO4)7:Eu2+. The local environments of Eu2+ ions and corresponding tunable photoluminescent properties, decay times and thermal stability are revealed systematically in detail. Specially, the excitation and emission spectra of Ca8MgGa1-yLay(PO4)7: Eu2+ are broadened gradually, finally towards a full-visible emission with 152 nm bandwidth spectrum for the phosphor Ca8MgLa(PO4)7: Eu2+. WLED with a high color rendering index (CRI = 95) and low color temperature (CCT = 3764 K) was fabricated based on the full-visible emission Ca8MgGa0.2La0.8(PO4)7: 0.08Eu2+ phosphors under a 365 nm chip, indicating the prominent potentials for high-color-rendering WLEDs. These results in current work provide new ideas for synergetic manipulation of components and multiple activator sites towards a full-visible emission in single-phase applied for white lighting.

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Держатели документа:
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, China

Доп.точки доступа:
Chen, H.; Zhang, Z.; Mi, R.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Yu.; Wang, B.; Mei, L.; Fang, M.; Wu, X.; Min, X.; Liu, Ya.
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3.


   
    Achieving ultra-broadband sunlight-like emission in single-phase phosphors: The interplay of structure and luminescence / Sh. Liu, L. Li, X. Qin [et al.] // Adv. Mater. - 2024. - Ст. 2406164, DOI 10.1002/adma.202406164. - Cited References: 43. - S.L. and L.L. contributed equally to this work. This work was financially supported by grants from the National Natural Science Foundationof China (NSFC, No. 52272174) and its joint project with Guangdong(Nos. U22A20135, U1801253 and U1301242) Province. J. Wang acknowl-edges Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) projects SML2021SP204, SML2023SP215/218/238. The authorsare grateful to Prof. Peter A. Tanner and Prof. Ka-Leung Wong for the indepth communication and valuable advice on the improvement of the manuscript. - Open access funding provided by Ecole Polytechnique Federale de Lausanne . - Article in press. - ISSN 0935-9648. - ISSN 1521-4095
Кл.слова (ненормированные):
artificial light source -- Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ -- convolutional neural network analysis -- mimicking sunlight -- portable photodetection devices
Аннотация: The quest for artificial light sources mimicking sunlight has been a long-standing endeavor, particularly for applications in anticounterfeiting, agriculture, and color hue detection. Conventional sunlight simulators are often cost-prohibitive and bulky. Therefore, the development of a series of single-phase phosphors Ca9LiMg1-xAl2x/3(PO4)7:0.1Eu2+ (x = 0-0.75) with sunlight-like emission represents a welcome step towards compact and economical light source alternatives. The phosphors are obtained by an original heterovalent substitution method and emit a broad spectrum   spanning from violet to deep red. Notably, the phosphor with x = 0.5 exhibits an impressive full width at half-maximum of 330 nm. A synergistic interplay of experimental investigations and theory unveils the mechanism behind sunlight-like emission due to the local structural perturbations introduced by the heterovalent substitution of Al3+ for Mg2+, leading to a varied distribution of Eu2+ within the lattice. Subsequent characterization of a series of organic dyes combining absorption spectroscopy with convolutional neural network analysis convincingly demonstrates the potential of this phosphor in portable photodetection devices. Broad-spectrum light source testing empowers the model to precisely differentiate dye patterns. This points to the phosphor being ideal for mimicking sunlight. Beyond this demonstrated application, the phosphor's utility is envisioned in other relevant domains, including visible light communication and smart agriculture.

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Держатели документа:
School of Chemical Engineering and Technology/School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, P. R. China
College of Materials, Xiamen University, Xiamen 361005, P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center SB RAS, Akademgorodok 50 bld.38, Krasnoyarsk 660036, Russia
International Research Center of Spectroscopy and Quantum Chemistry-IRC SQC, Siberian Federal University, 79 Svobodny Ave, Krasnoyarsk 660041, Russia
Institute of Sustainability for ChemicalsEnergy and Environment (ISCE2) Agency for ScienceTechnology and Research (A*STAR), 1 Pesek Road, Jurong Island 627833, Singapore
Institute of Chemical Sciences and Engineering Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland

Доп.точки доступа:
Liu, Sh.; Li, L.; Qin, X.; Du, R.; Sun, Y.; Xie, Sh.; Wang, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xi, Sh.; Bunzli, J.-C. G.; Zhou, L.; Wu, M.
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4.


   
    Structural and spectroscopic effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors / C. S. Lim, A. Aleksandrovsky, M. Molokeev [et al.] // Crystals. - 2023. - Vol. 13, Is. 2. - Ст. 362, DOI 10.3390/cryst13020362. - Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046) . - ISSN 2073-4352
   Перевод заглавия: Структурные и спектроскопические эффекты замещения Na+ на Li+ в LixNa1-xCaLa0.5Er0.05Yb0.45(MoO4)3 ап-конверсионных люминофорах типа шеелита
Кл.слова (ненормированные):
microwave sol-gel synthesis -- complex molybdate -- scheelite -- crystal structure -- Raman -- frequency up-conversion -- band structure
Аннотация: New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and Raman spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the Raman spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.

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Держатели документа:
Department of Aerospace Advanced Materials and Chemical Engineering, Hanseo University, Seosan 31962, Republic of Korea
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
School of Engineering and Construction, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia
Research and Development Department, Kemerovo State University, 650000 Kemerovo, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, 630073 Novosibirsk, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, 634034 Tomsk, Russia

Доп.точки доступа:
Lim, Chang S.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Atuchin, V.
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5.


   
    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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Держатели документа:
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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6.


   
    Site-engineering for controlling multiple-excitation and emission in Eu2+-activated CaSrSiO4 phosphors in marine fisheries / S. Liu, D. Wen, R. Du [et al.] // Adv. Optical Mater. - 2023. - Vol. 11, Is. 10. - Ст. 2203151, DOI 10.1002/adom.202203151. - Cited References: 19. - This work was financially supported by grants from the National Natural Science Foundation of China (NSFC, no. 51902355, and 52002411) and its joint project with Yunnan (no. U1702254) and Guangdong (no. U1801253) Provinces, and the GDAS’ Project of Science and Technology Development (no. 2022GDASZH-2022010104). The authors are grateful to Prof. Ru-shi Liu for the in-depth communication and valuable advice on the improvement of the manuscript . - ISSN 2195-1071
   Перевод заглавия: Управление кристаллографическими позициями для контроля многократного возбуждения и эмиссии в люминофорах CaSrSiO4, активированных Eu2+, для морского рыболовства
Кл.слова (ненормированные):
crystal-site engineering -- fish-attracting lamps -- multi-emission -- multi-excitation -- single-phase phosphors
Аннотация: Artificial light fishing technology has been used in marine fisheries for thousands of years. The light source with multi-color adjustable output is expected to become a new generation of fish-attracting lamps. Herein, a new method of crystal-site engineering through reducing atmospheres is proposed for the development of Eu2+ doped single-phase phosphor with multi-excitation and multi-emission properties. Following this approach, the distribution ratio of Eu2+ at Ca2+ and Sr2+ sites in CaSrSiO4 (CSO) can be modulated. Importantly, Eu2+ at both lattice sites exhibit non-interfering optical properties, CSO:Eu2+ phosphor realizes multi-color output from green to yellow and then to red when Eu2+ occupies the Sr2+ and Ca2+ sites in a relatively balanced ratio. Benefitting from the tunable color range covering the spectral sensitivity regions of most marine fishes, this phosphor may eventually be applied in futuristic innovative fish-attracting lamps.

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Держатели документа:
School of Marine Sciences/School of Chemical Engineering and Technology/School of Chemistry, Sun Yat-sen University, 519082/Guangzhou, Zhuhai, 510006 P. R. China
School of Applied Physics and Materials, WuYi University, Jiangmen, 529020 P. R. China
Guangdong Province Key Laboratory of Rare Earth Development and Application, Institute of Rare Metals, Guangdong Academy of Sciences, Guangzhou, 510651 P. R. China
Laboratory of Crystal Physics, Kirensky Institute of Physics Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Department of Engineering Physics and Radioelectronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia

Доп.точки доступа:
Liu, Shuifu; Wen, Dawei; Du, Rongkai; Jiang, Chunyan; Chen, Jun; Li, Junhao; Zhou, Lei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wu, Mingmei
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7.


   
    Site occupation engineering toward giant red-shifted photoluminescence in (Ba,Sr)2LaGaO5:Eu2+ phosphors / Yu Chen, Zh. Yang, J. Jin [et al.] // Chem. Mater. - 2023. - Vol. 35, Is. 20. - P. 8714-8721, DOI 10.1021/acs.chemmater.3c01980. - Cited References: 35. - This research was supported by the National Key Research and Development Program of China (2021YFB3500401 and 2021YFE0105700), the National Natural Science Foundations of China (Grant Nos. 51972118 and 52102169), the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137), the China Postdoctoral Science Foundation (2021M691053), and the Young Elite Scientists Sponsorship Program by China Association for Science and Technology (No. YESS20200053). This work was also supported by the Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program: “Advanced Digital Technologies”, contract no. 075-15-2022-314 . - ISSN 0897-4756. - ISSN 1520-5002
   Перевод заглавия: Управление заселенностью позиций для получения фотолюминесценции в люминофорах (Ba,Sr)2LaGaO5:Eu2+ с большим красным смещением
Аннотация: Exploring oxide-based red-emitting phosphors is essential for improving the color rendering index (Ra) and reducing the correlated color temperature (CCT) of white-light-emitting diode (LED) lighting sources. Especially, it is challenging to design Eu2+ red emission in inorganic solids. Here, the Eu2+-activated oxide phosphor Sr2LaGaO5:Eu2+ was synthesized with red emission peaking at 618 nm under 450 nm excitation. The crystal structure and spectral analysis indicate that Eu2+ tends to occupy [Sr1/LaO8] polyhedrons with a smaller coordination number, resulting in a large crystal field splitting at the 5d level and realizing the broadband 4f–5d red emission. When Sr is substituted by Ba atoms, density functional theory calculations verify that Ba tends to enter [Sr2O10] with a large coordination number, further giving rise to the lattice distortion and a giant spectral redshift (618–800 nm). The white LED device fabricated by mixing red Sr1.8Ba0.2GaO5:Eu2+ and green Lu3Al5O12:Ce3+ phosphors exhibits a high color rendering index (Ra = 92.1) and a low color-dependent temperature (CCT = 4570 K). This study will give guidance for exploring new Eu2+ activated oxide-based red phosphors as well as achieving tunable emission through cations’ substitution.

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Держатели документа:
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
Department of Mathematics and Physics,Chongqing Universityof Posts and Telecommunications, Chongqing 400065,China
Collegeof Physics, Taiyuan University of Technology, 030024 Taiyuan, China
Laboratory of Crystal Physics, Kirensky Institute of Physics,Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
World-Class Research Center “Advanced Digital Technologies”, Universityof Tyumen, Tyumen 625003, Russia
Department of Physics, University of the Free State, Bloemfontein ZA-9300, South Africa

Доп.точки доступа:
Chen, Yu; Yang, Zhiyu; Jin, Jiance; Qiao, Jianwei; Wang, Yuzhen; Molokeev, M. S.; Молокеев, Максим Сергеевич; Swart, Hendrik C.; Xia, Zhiguo
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8.


   
    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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9.


   
    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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10.


   
    Highly efficient Fe3+-doped A2 BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis / D. Liu, G. Li, P. Dang [et al.] // Light Sci. Appl. - 2022. - Vol. 11, Is. 1. - Ст. 112, DOI 10.1038/s41377-022-00803-x. - Cited References: 50. - This work was financially supported by the National Natural Science Foundation of China (NSFC Nos. 51720105015, 51932009, 51929201, 52072349), the Projects for Science and Technology Development Plan of Jilin Province (20210402046GH), and the Natural Science Foundation of Zhejiang Province (LR22E020004) . - ISSN 2095-5545
   Перевод заглавия: Высокоэффективные люминофоры A2BB'O6, легированные Fe3+ (A = Sr2+, Ca2+; B, B' = In3+, Sb5+, Sn4+), широкополосные люминофоры ближнего инфракрасного диапазона для спектроскопического анализа
Рубрики:
Optical properties of diamond
   Inorganic LEDs

Кл.слова (ненормированные):
Antimony compounds -- Efficiency -- III-V semiconductors -- Light emission -- Near infrared spectroscopy -- Optical properties -- Phosphors -- Spectroscopic analysis
Аннотация: Near-infrared (NIR)-emitting phosphor-converted light-emitting diodes have attracted widespread attention in various applications based on NIR spectroscopy. Except for typical Cr3+-activated NIR-emitting phosphors, next-generation Cr3+-free NIR-emitting phosphors with high efficiency and tunable optical properties are highly desired to enrich the types of NIR luminescent materials for different application fields. Here, we report the Fe3+-activated Sr2−yCay(InSb)1−zSn2zO6 phosphors that exhibit unprecedented long-wavelength NIR emission. The overall emission tuning from 885 to 1005 nm with broadened full-width at half maximum from 108 to 146 nm was realized through a crystallographic site engineering strategy. The NIR emission was significantly enhanced after complete Ca2+ incorporation owing to the substitution-induced lower symmetry of the Fe3+ sites. The Ca2InSbO6:Fe3+ phosphor peaking at 935 nm showed an ultra-high internal quantum efficiency of 87%. The as-synthesized emission-tunable phosphors demonstrated great potential for NIR spectroscopy detection. This work initiates the development of efficient Fe3+-activated broadband NIR-emitting phosphors and opens up a new avenue for designing NIR-emitting phosphor materials.

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Держатели документа:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
University of Science and Technology of China, Hefei, 230026, China
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
Zhejiang Institute, China University of Geosciences, Hangzhou, 311305, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
School of Material Science and Engineering, Shandong University, Jinan, 266071, China

Доп.точки доступа:
Liu, D.; Li, G.; Dang, P.; Zhang, Q.; Wei, Y.; Qiu, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lian, H.; Shang, M.; Lin, J.
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