Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.1016/j.cej.2022.134652

Ключевые слова: defect engineering, density functional theory, led, phosphors, positron annihilation technique, quantum efficiency

Аннотация: Lacking an effective strategy to simultaneously address the challenges of quantum efficiency, luminescence intensity and thermal stability has become the key bottleneck for further development and large-scale application of solid-state lighting technology. Herein, inspired by the defect-engineering used in photoelectrocatalytic andПоказать полностьюphotovoltaic materials, we acted in a diametrically opposite way and unprecedentedly proposed an anti-defect engineering strategy to develop high-efficiency phosphors. By constructing a rigid structure and introducing alkali metals M to remove cation vacancy defects, similar to building blocks and jigsaw puzzle, we developed three groups of whitlockite phosphors, namely Ca3-xSrx(PO4)2:Ce3+, Ca3(PO4)2:Ce3+,M and (Ca0.5Sr0.5)3(PO4)2:Ce3+,Na+,Mn2+, and synchronously realized the significant enhancement of photoluminescence intensity (2.46 times), thermal stability (87.92% at 150 °C), cathodoluminescence intensity (3.34 times), quantum yield (from 38.90% to 99.07%). We characterized the defect concentration by positron annihilation technique (PAT), and calculated Debye temperature (ΘD) and simulated the occupation of M according to DFT theory to reveal the improvement mechanism. Some advanced applications were also explored in this work, including warm-white LEDs, plant growth lighting and information security. The anti-defect engineering proposed in this work may contribute to the further development of high-efficiency phosphors for the next-generation smart solid-state lighting technologies. © 2022 Elsevier B.V.

Журнал: Chemical Engineering Journal

Выпуск журнала: Vol. 434

Номера страниц: 134652

ISSN журнала: 13858947

Издатель: Elsevier B.V.

• Pan X. (Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China, State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Provincial Key Laboratory of Materials Genome and College of Materials, Xiamen University, Xiamen, 361005, China)
• Mei L. (Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China)
• Zhuang Y. (State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Provincial Key Laboratory of Materials Genome and College of Materials, Xiamen University, Xiamen, 361005, China)
• Seto T. (Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Physical Science and Technology, Lanzhou University, No. 222, South Tianshui Road, Lanzhou, Gansu, 730000, China)
• Wang Y. (Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology, School of Physical Science and Technology, Lanzhou University, No. 222, South Tianshui Road, Lanzhou, Gansu, 730000, China)
• Plyaskin M. (Department of Engineering Physics and Radioelectronic, Siberian Federal University, 79 Svobodny Ave, Krasnoyarsk, 660041, Russian Federation)
• Xi W. (Center for Electron Microscopy, TUT-FEI Joint Laboratory, Tianjin Key Laboratory of Advanced Porous Functional Materials, Institute for New Energy Materials & LowCarbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China)
• Li C. (Center for Electron Microscopy, TUT-FEI Joint Laboratory, Tianjin Key Laboratory of Advanced Porous Functional Materials, Institute for New Energy Materials & LowCarbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China)
• Guo Q. (School of Gemology, China University of Geosciences, Beijing, 100083, China)
• Liao L. (Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing, 100083, China)

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