Sr3Y(BO3)3:Bi3+ phosphor with excellent thermal stability and color tunability for near-ultraviolet white-light LEDs. Issue 10 (24th February 2021)

• Record Type: Journal Article
• Authors: Wu, Sheng; Xiong, Puxian; Liu, Xiaoqi; Fu, Yubin; Liu, Quan; Chao, Yang; Dong, Quan; Li, Yuanyuan; Chen, Weiwei; Chen, Yan; Ma, Zhijun; Peng, Mingying
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 10(2021)
• Page Start: 3672
• Page End: 3681
• Publication Date: 2021-02-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc05960a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Bismuth activated blue-emitting phosphor Sr3 Y(BO3 )3 :Bi 3+ for near-ultraviolet white-light LEDs. Abstract : In this study, a blue fluorescent material Sr3 Y(BO3 )3 :Bi 3+ was synthesized by the high temperature solid-state reaction method. The corresponding structural characteristics, concentration and temperature dependent luminescence characteristics of Sr3 Y(BO3 )3 :Bi 3+ and the LED device performances were systematically studied. At different excitation wavelengths in the range of 340–375 nm, the photoluminescence (PL) region can be adjusted from green (CIE: (0.2524, 0.4063); Peak: 511 nm) to blue (CIE: (0.1936, 0.1236); Peak: 415 nm). The best excitation peaked at ∼370 nm, which well matches with the emission of a commercial near-ultraviolet (NUV) light-emitting diode (LED) chip. The thermal quenching experiment was performed, and the activation energy was calculated as 0.23 eV. At high temperature, the Sr2.55 Y(BO3 )3 :0.45Bi 3+ phosphor presented good thermal stability (79.99% of RT emission intensity at 420 K). LED devices (chip: 370 nm) using the Sr2.55 Y(BO3 )3 :0.45Bi 3+ phosphor as a fluorescent material showed excellent electroluminescence performance. Under a driving current of 20 mA, the devices showed CIE coordinates of (0.3842, 0.3980), a correlated color temperature (CCT) of 4053 K and a high color rendering index ( R a ) of 91.6. This work demonstrates that Sr3 Y(BO3 )3 :Bi 3+ is a promising NUV excited blue fluorescent material which shows advantage in white light-emitting diodes for solid-state lighting.