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

详细信息    查看全文

• 作者：Minhong Li ; LiLi Wang ; Weiguang Ran ; Chunyan Ren ; Zeling Song ; Jinsheng Shi ; ^{jsshiqn@aliyun.com}
• 关键词：Red phosphor ; Novel technical route ; Energy transfer ; Terbium bridge
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：184
• 期：Complete
• 页码：143-149
• 全文大小：2508 K
• 卷排序：184

文摘

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.