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    Tuning terahertz vibrations to control flexibility in soft porous crystals / A. E. J. Hoffman, J. Wieme, I. Senkovska [et al.] // 4th European conference on metal organic frameworks and porous polymers : Programme and book of abstracts. - 2021. - Ст. P-74 (S3P15). - Cited References: 7 . - ISBN 978-83-951195-7-6
   Перевод заглавия: Настройка терагерцовых колебаний для контроля гибкости мягких пористых кристаллов

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Hoffman, A. E. J.; Wieme, J.; Senkovska, I.; Krylov, A. S.; Крылов, Александр Сергеевич; Rogge, S. M. J.; Kaskel, S.; Speybroeck, V. V.; European conference on metal organic frameworks and porous polymers(4 ; 2021 ; Sept. 13-15 ; Kraków, Poland (virtual))
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    Photoluminescence tuning in Ba3ScB3O9:Eu2+ phosphor by crystal-site engineering / S. Lai, T. Hu, M. S. Molokeev, Z. Xia // Phys. Open. - 2021. - Vol. 8. - Ст. 100077, DOI 10.1016/j.physo.2021.100077. - Cited References: 31. - The present work was supported by the National Natural Science Foundation of China (Grant Nos. 51972118 and 51961145101), International Cooperation Project of National Key Research and Development Program of China (2021YFE0105700), the 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 2666-0326
   Перевод заглавия: Управление люминесценцией в люминофоре Ba3ScB3O9: Eu2+ методом кристаллической инженерии
Кл.слова (ненормированные):
Phosphor -- Photoluminescence tuning -- Crystal-site engineering -- Doping
Аннотация: Controlled photoluminescence tuning is essential for optimizing and accelerating the application of phosphor materials. Here, we adopt the crystal-site engineering method to tailor the photoluminescence properties in Ba3ScB3O9:Eu2+. Ba3ScB3O9 host contains multiple cationic sites which help to finely regulate Eu2+ site occupancies and thus the emission color. The relationship between Eu2+ emission and the local environments has been analyzed, and we demonstrate that the emission colors of the phosphors can be widely tuned from NIR to yellow by chemically driving the Eu2+ from octahedrally-coordinated Sc3+ sites to nine-fold coordinated Ba2+ sites. Our study will initiate and guide more explorations on discovering new phosphors through crystal-site engineering.

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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, 510641, 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
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Lai, S.; Hu, T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
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    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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    Green-emitting Bi3+-doped La2SrSc2O7 phosphor for pc-WLED lighting: Luminescent properties and energy transfer strategy / W. Yan, Y. Wei, M. S. Molokeev [et al.] // J. Alloys Compd. - 2022. - Vol. 908. - Ст. 164621, DOI 10.1016/j.jallcom.2022.164621. - Cited References: 63. - This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072349) . - ISSN 0925-8388
   Перевод заглавия: Зеленый люминофор La2SrSc2O7, легированный Bi3+, для светодиодного освещения: люминесцентные свойства и стратегия передачи энергии
Кл.слова (ненормированные):
Green phosphor -- Bi3+ -- Energy transfer strategy -- Color tuning -- Pc-WLED devices
Аннотация: The crystal structure, photoluminescence properties, thermal stability and corresponding mechanisms of the novel Bi3+, Eu3+-doped La2SrSc2O7 (LSS) phosphors have been measured and analyzed in details. The emission spectrum of LSS: 1.0%Bi3+ phosphor shows a novel green emission centered at 530 nm under 340 nm excitation, which is attributed to the 3P1→1S0 transition of Bi3+ ions. By designing Bi3+→Eu3+energy transfer strategy, luminescence colors of LSS: 1.0%Bi3+, yEu3+ (y = 0–5.0%) phosphors can be tuned from green to orange with increasing Eu3+ concentration, which achieve multiple emission colors in LSS host. The photoluminescence decay curves, average decay lifetimes, energy transfer efficiency and time-resolved emission spectra of LSS: 1.0%Bi3+, yEu3+ (y = 0–5.0%) phosphors prove the existence of energy transfer from Bi3+ to Eu3+. The prototype pc-WLED device with green-emitting LSS: 1.0%Bi3+ possesses high color rendering index (CRI = 96.0) and low correlated color temperature (CCT = 4306 K). These results provide clear evidences that LSS: Bi3+and LSS: 1.0%Bi3+, Eu3+ phosphors would be novel promising green-to-orange tunable phosphor candidates for pc-WLED applications.

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Держатели документа:
Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Hubei, Xiangyang, 441053, China
Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan, 430074, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Yan, W.; Wei, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Wang, S.; Li, G.
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Phase matched conversion of radiation in nonlinear photonic crystals of strontium tetraborate / A. S. Aleksandrovsky [et al.] // Proceedings of SPIE - The International Society for Optical Engineering. - 2011. - Vol. 7993: ICONO 2010: International Conference on Coherent and Nonlinear Optics (23 August 2010 through 26 August 2010, Kazan, ) Conference code: 83828, DOI 10.1117/12.872943 . - ISBN 0277786X (ISSN); 9780819485663 (ISBN)
Кл.слова (ненормированные):
nonlinear photonic crystal -- random quasi phase matching -- second harmonic generation -- strontium tetraborate -- average power -- deep uv -- enhancement factor -- fs pulse -- monodomains -- nonlinear photonic crystals -- quasi-phase-matched frequency doubling -- radiation source -- random quasi phase matching -- rotational shift -- second harmonic generation -- tetraborate -- tuning ranges -- band structure -- harmonic generation -- nonlinear optics -- optical materials -- phase matching -- quantum optics -- strontium -- photonic crystals
Аннотация: Random quasi-phase-matched frequency doubling of fs pulses to the deep UV was obtained in 1D nonlinear photonic crystal (NPC) of strontium tetraborate. Tuning range of generated radiation is from 187.5 to 215 nm. The spectrum of generated radiation consists from series of peaks with the width of order of 1 A. These peaks are the manifestation of the NPC band structure. Using fs oscillator as the fundamental radiation source, maximum average power of generated radiation is of order 1 ?W, the enhancement factor with respect to monodomain sample being of order of several hundred. The red rotational shift of NPC band structure is experimentally demonstrated. © 2011 SPIE.

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Держатели документа:
Kirensky Institute of Physics, Akademgorodok 50/38, 660036, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodniy 79, 660041, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Aleksandrovsky, A.S.; Vyunishev, A.M.; Zaitsev, A.I.; Ikonnikov, A.A.; Pospelov, G.I.; Slabko, V.V.
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    Data-driven photoluminescence tuning in Eu2+-doped phosphors / S. Lai, M. Zhao, J. Qiao [et al.] // J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 14. - P. 5680-5685, DOI 10.1021/acs.jpclett.0c01471. - Cited References: 34. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51972118, 51961145101 and 51722202), Fundamental Research Funds for the Central Universities (D2190980), Guangzhou Science & Technology Project (202007020005), Guangdong Provincial Science & Technology Project (No. 2018A050506004), 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 1948-7185
   Перевод заглавия: Настройка фотолюминесценции люминофоров, легированных Eu2+, за счет анализа базы данных
Рубрики:
Phosphors
   Luminescence properties
   Crystal structure
   Ions
   Quantum mechanics
Аннотация: Discovery of rare earth phosphors has generally relied on the chemical intuition and time-intensive trial-and-error synthesis; therefore, finding new materials assisted by data-driven computations is urgent. Herein, we utilize a regression model to predict the emission wavelengths of Eu2+-doped phosphors by revealing the relationships between the crystal structure and luminescence property. The emission wavelengths of [Rb(1–x)K(x)]3LuSi2O7:Eu2+ (0 ≤ x ≤ 1) phosphors, as examples for the data-driven photoluminescence tuning, are successfully predicted on the basis of the existing data of only eight systems, also consistent with the experimental results. These phosphors can be excited by blue light and exhibit broad-band red and near-infrared emission ranging from 619 to 737 nm. These findings in Eu2+-doped silicate phosphors indicate that data-driven computations through the regression mode would have bright application in discovering novel phosphors with a target emission wavelengths.

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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, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology BeijingBeijing 100083, 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
Department of Physics, Far Eastern State Transport University, Russian Federation

Доп.точки доступа:
Lai, S.; Zhao, M.; Qiao, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
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    Structure analysis, tuning photoluminescence and enhancing thermal stability on Mn4+-doped La2-xYxMgTiO6 red phosphor for agricultural lighting / S. Gai, H. Zhu, P. Gao [et al.] // Ceram. Int. - 2020. - Vol. 46, Is. 12. - P. 20173-20182, DOI 10.1016/j.ceramint.2020.05.095. - Cited References: 40. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 21706060 , 51703061 , 51974123 ), the Hunan Graduate Research and Innovation Project (Grant No. CX2018B396 ), the Hunan provincial Engineering Technology Research Center for Optical Agriculture (Grant No. 2018TP2003 ), the Scientific Research Fund of Hunan Provincial Education Department (15K058, 19C0903), the Natural Sciences Foundation of Hunan agricultural university, China (Grant No. 19QN11), the Science and Technology project of Changsha (KH1801219) and the Huxiang high level talent gathering project (2019RS1077) . - ISSN 0272-8842
   Перевод заглавия: Анализ структуры, управление фотолюминесценцией и улучшенная термостойкость легированного Mn4+ красного люминофора La2-xYxMgTiO6 для сельскохозяйственного освещения
Кл.слова (ненормированные):
La2-xYxMgTiO6:Mn4+ -- Cation substitution -- Tunable photoluminescence -- Thermal stability -- Plant growth LED lighting
Аннотация: Currently, phosphor-converted LEDs (pc-LEDs) are revolutionizing the industry of plant growth lighting. To meet the requirements of this technology, phosphors with tunable photoluminescence, high thermal stability and luminous intensity are required. Herein, we found that the simple substitution of yttrium for lanthanum in La2MgTiO6:Mn4+ (LMT:Mn4+) system could satisfy above three criteria simultaneously. The photoluminescence properties can be regulated by continuously controlling the chemical composition of La2-xYxMgTiO6:Mn4+ solid solution. The La sites are occupied by Y ions, causing a significant blue shift in the emission spectra which owing to the change of local crystal field strengthen. Meanwhile, the thermal stability and decay lifetimes are also varied due to the variation of local structure and band gap energy. The thermal stability of the material reaches 83.5% at 150 °C, which is better than the reported La2MgTiO6:Mn4+ and Y2MgTiO6:Mn4+ phosphors. The electronic luminescence (EL) of pc-LED devices using La2-xYxMgTiO6:Mn4+ red phosphor is evaluated, which matching the absorption regions of plant pigments well, reflecting the superiority of the studied phosphors in plant growth lighting areas.

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Держатели документа:
School of Chemistry and Materials Science, Hunan Agricultural University, Changsha, 410128, China
Hunan Optical Agriculture Engineering Technology Research Center, Changsha, 410128, China
College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
School of Architecture and Art, Central South University, Changsha, 410083, China

Доп.точки доступа:
Gai, S.; Zhu, H.; Gao, P.; Zhou, C.; Kong, Z.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Qi, Z.; Zhou, Z.; Xia, M.
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    Tuning of the coordination and emission properties of 4-amino-2,1,3-benzothiadiazole by introduction of diphenylphosphine group / T. S. Sukhikh, R. M. Khisamov, D. A. Bashirov [et al.] // Cryst. Growth Des. - 2020. - Vol. 20, Is. 9. - P. 5796-5807, DOI 10.1021/acs.cgd.0c00406. - Cited References: 58. - This work is supported by the Russian Science Foundation (project no. 19-73-00030) and partly by RFBR (viz., powder XRD data processing and determination of the structure of 1. CINF7/INFHINF8/INF using powder XRD) according to the research project no. 19-52-80003. We acknowledge the European Synchrotron Radiation Facility for provision of synchrotron radiation facilities and thank Prof. Andrew N. Fitch. We are grateful to Siberian Supercomputer Centre of Institute of Computational Mathematics and Mathematical Geophysics for computational capability and thank the technical staff of the Institute for the assistance . - ISSN 1528-7483. - ISSN 1528-7505
   Перевод заглавия: Настройка координационных и эмиссионных свойств 4-амино-2,1,3-бензотиадиазола путем введения дифенилфосфиновой группы

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
COMPLEXES
   BENZOTHIADIAZOLE
   CHEMISTRY
   SUBSTITUENTS
   LIGANDS
   PROGRAM
Аннотация: A novel amino-benzothiadiazole bearing diphenylphosphine groups (L) was designed and synthesized. A number of its coordination compounds of Cu(I) (1·0.75C7H8, 2a,b), Pd(II) (4), and Pt(II) (5) were prepared demonstrating the coordination of L ligand via N and/or P atoms. The reaction with strong Lewis acid Zn(II) resulted in the rearrangement of P—N—P to P–P–N moiety and formation of complex 3. The structures of L, 2–5 were determined by single crystal X-ray (XRD) diffraction, while that of 1·0.75C7H8 was determined by powder XRD analysis. Intermolecular secondary bonding of S···S interactions in the compounds, unusual for benzothiadiazoles, was discussed supported by quantum chemical calculations. Differences in the structures of the compounds cause significant changes of photophysical properties. In particular, the position of the electronic absorption band is featured by the conformation of L, viz., the dihedral angle between the benzothiadiazole unit and the P—N—P moiety, as proved by TD-DFT calculations performed on model molecules. The photophysical properties of the compounds also strongly depend on the coordination mode of L: the presence of a bond between the metal and the N atom of the thiadiazole unit plays an essential role in defining the position of the absorption and emission bands as well as emission lifetime of these compounds. The thermally activated delayed fluorescence and phosphorescence mechanisms in a thermal equilibrium were determined for 1·0.75C7H8. Complex 5 features a broad emission band spanning the entire visible region; moreover, it shows an unusual clear-white luminescence, which remains visible even in the daylight.

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Держатели документа:
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Novosibirsk State Univ, Natl Res Univ, Dept Nat Sci, Novosibirsk 630090, Russia.
Shihexi Univ, Dept Chem, Shihezi 832000, Xinjiang, Peoples R China.

Доп.точки доступа:
Sukhikh, Taisiya S.; Khisamov, Radmir M.; Bashirov, D. A.; Komarov, Vladislav Yu; Molokeev, M. S.; Молокеев, Максим Сергеевич; Ryadun, Alexey A.; Benassi, E.; Konchenko, Sergey N.; Russian Science FoundationRussian Science Foundation (RSF) [19-73-00030]; RFBRRussian Foundation for Basic Research (RFBR) [19-52-80003]
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Co/multi-walled carbon nanotubes/polyethylene composites for microwave absorption: Tuning the effectiveness of electromagnetic shielding by varying the components ratio / M. A. Kazakova, N. V. Semikolenova, E. Y. Korovin [et al.] // Compos. Sci. Technol. - 2021. - Vol. 207. - Ст. 108731, DOI 10.1016/j.compscitech.2021.108731. - Cited References: 45. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation within the state assignment for Boreskov Institute of Catalysis (project # АААА-А21-121011390054-1) . - ISSN 0266-3538
Кл.слова (ненормированные):
Polymer composites -- Multi-walled carbon nanotubes -- Co nanoparticles -- Hybrid structures -- Electromagnetic interference shielding
Аннотация: We present novel polyethylene (PE) composites for electromagnetic interference (EMI) shielding application. They are based on cobalt modified multi-walled carbon nanotubes (MWCNTs) produced via in situ polymerization of ethylene, with the Ti-Ziegler–Natta catalyst preliminarily immobilized on Co/MWCNT hybrids. The electromagnetic properties of the composites were tuned by varying the filler loading and Co:MWCNT ratio. The microstructure of the composites and electromagnetic absorption process were carefully characterized by transmission and scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry, ferromagnetic resonance and vector network analysis. The electromagnetic wave absorbing properties of the nanocomposite were investigated in the 10 MHz−18 GHz frequency range revealing that the EMI absorption properties can be tuned by varying the Co:MWCNT weight ratio in the filler. Interestingly, the Co/MWCNT-PE composite with a total filler and Co loading of only 12 and 1.7 wt%, respectively, showed extremely high reflection loss (RL) of −55 dB. More importantly, an effective bandwidth of 12.8–17.8 GHz (RL below −10 dB) was achieved for a matching thickness of only 1.5 mm. The specific RL value (RL/filler loading) of the composite was superior in comparison with the previously reported nanostructured carbon materials. The highly effective absorbing properties of Co/MWCNT-PE composites are explained primarily by the unprecedented uniform filler distribution in the polyethylene as well as by the synergistic effect of MWCNTs and Co nanoparticles. This approach thus offered an effective strategy to design cost-effective, lightweight and flexible EMI shielding materials with tunable dielectric and magnetic performance.

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Держатели документа:
Boreskov Institute of Catalysis, SB RAS, Lavrentieva 5, Novosibirsk, 630090, Russian Federation
National Research Tomsk State University, Lenin Ave. 36, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, SB RAS, Akademgorodok St. 50, Krasnoyarsk, 660036, Russian Federation
TOTAL Research and Technology Feluy (TRTF), Zone Industrielle C, Feluy, 7181, Belgium
Soft Matter Science and Engineering (SIMM), UMR CNRS 7615, ESPCI Paris, Universite PSL, Sorbonne Universite, Paris, 75005, France

Доп.точки доступа:
Kazakova, M. A.; Semikolenova, N. V.; Korovin, E. Y.; Zhuravlev, V. A.; Selyutin, A. G.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Moseenkov, S. I.; Andreev, A. S.; Lapina, O. B.; Suslyaev, V. I.; Matsko, M. A.; Zakharov, V. A.; Lacaillerie, J. -B.D.D.
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10.

    Enhanced cyan emission and optical tuning of Ca3Ga4O9:Bi3+ for high-quality full-spectrum white light-emitting diodes / D. J. Liu, X. H. Yun, G. G. Li [et al.] // Adv. Opt. Mater. - 2020. - Vol. 8, Is. 22. - Ст. 2001037, DOI 10.1002/adom.202001037. - Cited References: 55. - This work was financially supported by the National Natural Science Foundation of China (NSFC No. 51932009, 51720105015, 51672265, 51672266, 51672257 and 51672259), the Key Research Program of Frontier Sciences, CAS (Grant No. YZDY-SSW-JSC018), Science and Technology Cooperation Project between Chinese and Australian Governments (2017YFE0132300), the Jiangmen Innovative Research Team Program (2017), and the Major Program of Basic Research and Applied Research of Guangdong Province (2017KZDXM083) . - ISSN 2195-1071
   Перевод заглавия: Улучшенное голубое излучение и оптическая настройка Ca3Ga4O9:Bi3+ для получения высококачественных белых светодиодов полного спектра

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
ENERGY-TRANSFER
   TUNABLE LUMINESCENCE
   PHOSPHOR
   CRYSTAL
   MODULATION
Кл.слова (ненормированные):
cyan-emitting phosphors -- full-spectrum white lighting -- optical tuning -- single-phased white light-emitting diodes
Аннотация: Highly efficient cyan‐emitting phosphor materials are indispensable for closing the cyan gap in spectra of the traditional phosphor‐converted white light‐emitting diodes (WLEDs) to achieve high‐quality full‐spectrum white lighting. In this work, bright cyan‐emitting Ca3Ga4O9 (CGO):0.02Bi3+,0.07Zn2+ phosphor is developed to bridge the cyan gap. Such a Bi3+,Zn2+ codoping enhances the cyan emission of CGO:0.02Bi3+ by 4.1 times due to the influence of morphology and size of phosphor particles, charge compensation and lattice distortion. Interestingly, codoping La3+ ions into the current system can achieve a photoluminescence tuning of CGO:0.02Bi3+ from cyan to yellowish‐green by crystallographic site engineering. Besides, Bi3+–Eu3+ energy transfer is successfully realized in CGO:0.02Bi3+,0.07Zn2+,nEu3+ phosphors and the emission color tuning from cyan to orange is observed. The investigation of thermal quenching behaviors reveals that the incorporation of Zn2+ and La3+ improves the thermal stability of CGO:0.02Bi3+. Finally, CGO:0.02Bi3+,0.07Zn2+,0.10Eu3+ phosphor is employed to obtain a single‐phased warm WLED device. A full‐spectrum WLED device with remarkable color rendering index (Ra) of 97.4 and high luminous efficiency of 69.72 lm W−1 is generated by utilizing CGO:0.02Bi3+,0.07Zn2+ phosphor. This result suggests the important effect of CGO:0.02Bi3+,0.07Zn2+ phosphor on closing the cyan gap, providing new insights of cyan‐emitting phosphors applied in full‐spectrum white lighting.

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Держатели документа:
Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China.
Univ Sci & Technol China, Sch Appl Chem & Engn, Hefei 230026, Peoples R China.
China Univ Geosci, Fac Mat Sci & Chem, Engn Res Ctr Nanogeomat, Minist Educ, Wuhan 430074, Peoples R China.
RAS, SB, Lab Crystal Phys, Kirensky Inst Phys,Fed Res Ctr,KSC, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Shandong Univ, Sch Mat Sci & Engn, Jinan 266071, Peoples R China.
Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Guangdong, Peoples R China.

Доп.точки доступа:
Liu, Dongjie; Yun, Xiaohan; Li, Guogang; Dang, Peipei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lian, Hongzhou; Shang, Mengmeng; Lin, Jun
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