An efficient green phosphor of Ce3+ and Tb3+-codoped Ba2Lu5B5O17 and a model for elucidating the high thermal stability of the green emission. Issue 22 (24th May 2018)

• Record Type: Journal Article
• Authors: Xiao, Yu; Hao, Zhendong; Zhang, Liangliang; Zhang, Xia; Pan, Guo-Hui; Wu, Hao; Wu, Huajun; Luo, Yongshi; Zhang, Jiahua
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 22(2018)
• Page Start: 5984
• Page End: 5991
• Publication Date: 2018-05-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc05614a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Green phosphors codoped with Ce 3+ and Tb 3+ have been studied extensively for application in UV-based white LEDs, but only few of them show both high luminescence efficiency and thermal stability. Abstract : Green phosphors codoped with Ce 3+ and Tb 3+ have been studied extensively for application in UV-based white LEDs, but only few of them show both high luminescence efficiency and thermal stability. This study reports a new green phosphor of Ce 3+ and Tb 3+ -codoped Ba2 Lu5 B5 O17 prepared by a solid-state reaction. Emission color tuning from blue to green was studied as a function of Tb 3+ concentration under UV excitation and well-described based on energy transfer from Ce 3+ to Tb 3+ . The Tb 3+ emission endowed the green phosphor with a high quantum yield of 86%, and a high thermal stability over the 303–483 K range was achieved. A model has been proposed to explain a general phenomenon observed in Ce 3+ and Tb 3+ -codoped phosphors that Tb 3+ emission is thermally more stable than the Ce 3+ emission. A relationship between the temperature dependencies of Tb 3+ and Ce 3+ emissions was obtained in connection with room temperature energy transfer efficiency. The thermally stable Tb 3+ emission was well-predicated using the obtained relationship. The new phosphor was employed for fabricating a UV-based white LED. A high color-rendering index of 91.4 at a low correlated color temperature of 3809 K is obtained, indicating promising application of Ba2 Lu5 B5 O17 :Ce 3+, Tb 3+ in solid-state lighting.