Simultaneously tuning the emission color and improving thermal stability via energy transfer in apatite-type phosphors. Issue 45 (13th November 2017)

• Record Type: Journal Article
• Authors: Wu, Dan; Xiao, Wenge; Zhang, Liangliang; Zhang, Xia; Hao, Zhendong; Pan, Guo-Hui; Luo, Yongshi; Zhang, Jiahua
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 45(2017)
• Page Start: 11910
• Page End: 11919
• Publication Date: 2017-11-13
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc03941g
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The thermal stability of Ba2 Y3 (SiO4 )3 F:Ce 3+ can be improved by the introduction of Tb 3+ due to the combined effect of fast energy transfer within the nearest Ce 3+ –Tb 3+ pairs and the following energy diffusion among the Tb 3+ ions. Abstract : Developing phosphors with high quantum efficiency and superior thermal stability is still a challenge for phosphor-converted white light-emitting diodes (w-LEDs). Energy transfer between ions is usually utilized to tune the emission wavelength. In this study, we demonstrate that in addition to the tunable emission color, an improved thermal stability can be achieved by energy transfer from Ce 3+ to Tb 3+ in Ce 3+ and Tb 3+ codoped Ba2 Y3 (SiO4 )3 F (BYSF:Ce 3+, Tb 3+ ) phosphors without quantum efficiency loss, which is ascribed to the combined effect of fast energy transfer within the nearest Ce 3+ –Tb 3+ pairs via electric dipole–quadrupole interactions, and the following energy diffusion among the Tb 3+ ions. An efficient energy transfer from Ce 3+ to Tb 3+ results in the novel green phosphor BYSF:2%Ce 3+, 40%Tb 3+ with an internal quantum efficiency of as high as 83.12%. In addition, a w-LED lamp was fabricated to explore its possible application in w-LEDs based on near UV LEDs. Our results indicate that fast energy transfer to Tb 3+ may provide an alternative way of improving the thermal stability of phosphors.