Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.1002/adom.202100077

Ключевые слова: Eu <sup>2+</sup>, photoluminescence, Red phosphor, Site occupancy

Аннотация: Red spectrum loss in phosphor-converted light-emitting diodes (pc-LEDs) restricts high-quality warm-white lighting. Herein, two blue-light excitable red-emitting Sr₃LnAl₂O_7.5:Eu (Ln = Y or Lu) phosphors are reported, and red emission originating from an unprecedented substitution model, with Eu²⁺ occupied sixfold octahedrally coordinated lanthanide (Ln³⁺) sites is demonstrated. Site occupancy identification reveals that three different sites are occupied by Eu²⁺ and one distinct site is occupied by Eu³⁺, and the Eu²⁺ stabilized at Ln³⁺ site accompanied by Eu³⁺ selectively occupies at Sr²⁺ site as a charge compensator. An anomalous prolonged Eu²⁺-photoluminescence decay emission with increasing temperature in the low-temperature region is demonstrated. This accounts for the trapped electrons, which are thermally released from shallow traps and eventually populate the Eu²⁺ 5d level to form an excited-state Eu²⁺. The findings help better understand Eu²⁺ occupancy and luminescence. These also provide a new perspective for the exploration of novel Eu²⁺ activated oxide-based red phosphor for pc-LEDs.

Журнал: Advanced Optical Materials

Выпуск журнала: Т. 9, № 9

Номера страниц: 2100077

ISSN журнала: 21951071

• Hu T. (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)
• Xia Z. (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)
• Zhang Q. (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)
• Gao Y. (School of Applied Physics and Materials,Wuyi University)
• Molokeev M.S. (Department of Physics,Far Eastern State Transport University)

• Ядро РИНЦ (eLIBRARY.RU)