Enhancing Sm3+ red emission via energy transfer from Bi3+ → Sm3+ based on terbium bridge mechanism in Ca2Al2SiO7 phosphors

被引：26

作者：

Li, Minhong ^{[1
]}

Wang, LiLi ^{[1
]}

Ran, Weiguang ^{[1
]}

Ren, Chunyan ^{[1
]}

Song, Zeling ^{[1
]}

Shi, Jinsheng ^{[1
]}

机构：

[1] Qingdao Agr Univ, Qingdao 266109, Peoples R China

来源：

JOURNAL OF LUMINESCENCE | 2017年 / 184卷

关键词：

Red phosphor; Novel technical route; Energy transfer; Terbium bridge; LIGHT-EMITTING DIODES; TUNABLE LUMINESCENCE; PHOTOLUMINESCENCE PROPERTIES; WHITE LEDS; EU2+; EU3+; CE3+;

D O I：

10.1016/j.jlumin.2016.12.014

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Currently, the key change for white-LED is to improve the luminescence efficiency of red phosphor. Sm3+ activated phosphor was considered due to suitable emission position of red light. However, the luminescence intensity in the red region is weak. For enhancing red-emitting of SM3+, Bi3+ and Tb3+ ions were introduced into Ca2Al2SiO7:Sm3+ phosphors based on the concept of energy transfer. For Ca2Al2SiO7:Bi3+, Sm3+ samples, it can be observed that the energy transfer process was blocked. Hence, Tb3+ was introduced into Ca2Al2SiO7:Bi3+, Sm3+ samples to increase Sm3+ luminescence intensity based on Bi3+ -> Tb3+ Sm3+ energy transfer process. Compared with Sm3+ single-doped Ca2Al2SiO7 phosphor, the luminescence intensity of Sm3+ was enhanced by 2.6 times. It can be found that Tb3+ ions play a role of storing the energy or transfer bridge from Bi3+ Sm3+ by investigating the Ca2Al2SiO7:Bi3+, Tb3+ and Ca2Al2SiO7:Tb3+, Sm3+ energy transfer mechanism. All these results suggest that terbium branch mechanism plays an important role on enhancing activators luminescence intensity. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：143 / 149

页数：7

共 32 条

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