Improving Quantum Efficiency and Thermal Stability in Blue-Emitting Ba<sub>2–<i>x</i></sub>Sr<sub><i>x</i></sub>SiO<sub>4</sub>:Ce<sup>3+</sup> Phosphor via Solid Solution

Xiaoyu Ji(Hunan Normal University), Jilin Zhang(Hunan Normal University), Ying Li(Hunan Normal University), Shuzhen Liao(Hunan Institute of Engineering), Xinguo Zhang(Southern Medical University), Zhiyu Yang(Minzu University of China), Zhengliang Wang(Minzu University of China), Zhongxian Qiu(Hunan Normal University), Wenli Zhou(Hunan Normal University), Liping Yu(Hunan Normal University), Shixun Lian(Hunan Normal University)
Chemistry of Materials
July 19, 2018
10.1021/acs.chemmater.8b01652
Cited by 240

Abstract

Ba1.8–xSrxSiO4:0.1Ce3+,0.1Na+ (x = 0–1.8) phosphors were prepared by a high-temperature solid-state reaction. The emission peaks of Ba1.8–xSrxSiO4:0.1Ce3+,0.1Na+ shift from 391 to 411 nm with increasing Sr2+ content under excitation by a UV light at around 360 nm. Ba0.4Sr1.4SiO4:0.1Ce3+,0.1Na+ phosphor exhibits the best performance of luminescence, whose absolute quantum efficiency is 97.2%, and the emission intensity at 150 °C remains 90% of that at room temperature. The effect of replacing Ba2+ by Sr2+ on the red shift of the emission band and the increase of quantum efficiency (QE) and thermal stability (TS) was investigated in detail based on the Rietveld refinements, Raman spectra, thermoluminescence, and decay curves, etc. The performance of UV chip-based pc-LEDs indicates that Ba0.4Sr1.4SiO4:0.1Ce3+,0.1Na+ can be a promising blue phosphor for white-emitting pc-LEDs.

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