文献类型：期刊文献

英文题名：An Efficient Narrow-band Blue-emitting Phosphor Ba₃Y₂B₆O₁₅:Bi³⁺ and Its Application

作者：Liang, Pan Zhang Hongshu Huang Hongsheng Li Saying Zhang Xiaotian Wang, Ying Li Lianqing Liu Zhihong

第一作者：Liang, Pan

通信作者：Li, LQ[1];Liu, ZH[2]

机构：[1]Shaanxi Xueqian Normal Univ, Sch Chem & Chem Engn, Xian 710100, Peoples R China;[2]Shaanxi Normal Univ, Sch Chem & Chem Engn, Xian 710062, Peoples R China;[3]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China

第一机构：Shaanxi Xueqian Normal Univ, Sch Chem & Chem Engn, Xian 710100, Peoples R China

通信机构：corresponding author), Shaanxi Xueqian Normal Univ, Sch Chem & Chem Engn, Xian 710100, Peoples R China;corresponding author), Shaanxi Normal Univ, Sch Chem & Chem Engn, Xian 710062, Peoples R China.

年份：2023

卷号：81

期号：4

起止页码：371-380

外文期刊名：ACTA CHIMICA SINICA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000989493400007)】；

基金：Project supported by the National Natural Science Foundation of China (Nos. 22003035, 21963006) and the Shaanxi Provincial Education Department Project (No. 21JK0587).

语种：英文

外文关键词：highly-efficient phosphor; narrow-band emitting; blue phosphor; Ba3Y2B6O15:Bi3+

摘要：At present, the development of efficient (high quantum efficiency and high thermal stability) narrow-band emitting phosphors is a crucial problem in the application of white light emitting diodes (WLED) for high-performance liquid crystal display (LCD) backlights. In this work, an efficient narrow-band blue emitting phosphor Ba3Y2B6O15:Bi3+ was prepared by high temperature solid state method, and its structure and properties were characterized and calculated. By using the density functional theory (DFT), Ba3Y2B6O15 is calculated to be a direct band gap material with a high band gap value of 4.67 eV, which is a necessary condition for achieving high quantum efficiency phosphors. The experiment results show that Ba3Y2B6O15:0.5%Bi3+ has a narrow-band blue-emitting spectrum with a full width at half maximum (FWHM) of 2168 cm(-1) (36.2 nm) at 409 nm, which is owing to the P-3(1) -> S-1(0) transition of Bi3+ ions. The emission spectra of Ba3Y2B6O15:0.5%Bi3+ can be split into two peaks at 406 and 422 nm, respectively, because there are two kinds of Y ions (Y1 and Y2) in the crystal cell of Ba3Y2B6O15. Under the 365 nm UV radiation, the Ba3Y2B6O15:0.5%Bi3+ exhibits high internal quantum efficiency (IQE=93.8%), and ultra-high color purity (98.9%). The high quantum efficiency and narrow-band emission spectrum are mainly due to the compact and highly symmetric crystal structure of Ba3Y2B6O15 matrix. The photoluminescence (PL) intensity of Ba3Y2B6O15:0.5%Bi3+ remains 73.9% of the initial intensity at 150 degrees C, and there is almost no color drift. The thermal quenching activation energy (Ea) of Ba3Y2B6O15:0.5%Bi3+ was calculated to be 0.290 eV by the Arrhenius Equation, which indicates that Ba3Y2B6O15:0.5%Bi3+ has high thermal stability. When Y3+ is partially substituted by Sc3+, the emission spectrum of Ba(3)ScxY(2)-xB(6)O(15):Bi3+ (0 <= x <= 1.6) is redshifted with the increase of x. Finally, the blue phosphor Ba3Y2B6O15:0.5%Bi3+ was mixed with commecial green and red phosphors and then coated them on a 365 nm chip to fabricate a WLED device. Under a driven current of 20 mA, the correlated color temperature of the obtained WLED is 5679 K and the color gamut can reach 95.3% NTSC. Above results indicate that Ba3Y2B6O15:Bi3+ is a promising phosphor for high-performance LCD backlights.