文献类型：期刊文献

中文题名：一种高效窄带蓝色荧光粉Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+)及其应用研究

英文题名：An Efficient Narrow-band Blue-emitting Phosphor Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+) and Its Application

作者：梁攀 张宏淑 黄宏升 李飒英 张笑恬 王英 李连庆 刘志宏

第一作者：梁攀

通信作者：Li, LQ[1];Liu, ZH[2]

机构：[1]陕西学前师范学院化学化工学院,西安710100;[2]陕西师范大学化学化工学院,西安710062;[3]贵州理工学院化学工程学院,贵阳550003

第一机构：陕西学前师范学院化学化工学院,西安710100

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

中文期刊名：化学学报

外文期刊名：Acta Chimica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

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：中文

中文关键词：高效荧光粉;窄带发射;蓝色荧光粉;Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+)

外文关键词：highly-efficient phosphor;narrow-band emitting;blue phosphor;Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+)

摘要：目前,高效窄带荧光粉的研发对于白光发光二极管(WLED)向高性能液晶显示器背光源的应用至关重要.本工作采用高温固相法制备了一种高效窄带蓝色荧光粉Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+),并对其结构和性能进行了表征和计算.计算表明,Ba_(3)Y_(2)B_(6)O_(15)的带隙较宽,为4.67 eV,宽的带隙为高效率荧光粉提供了保障. Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)(0.5%为摩尔分数)的发射光谱峰值在409nm,半峰宽仅为2168cm^(-1)(36.2nm),属于窄带蓝光发射.Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)的内量子效率高达93.8%,色纯度也高达98.9%,其热稳定性能也较好,在150℃时的发光强度是室温发光强度的73.9%,且几乎没有色漂移.当Y被Sc部分取代时, Ba_(3)Sc_(x)Y_(2-x)B_(6)O_(15):Bi^(3+)(0≤x≤1.6)的发射光谱随着x的增大而发生红移.最终,将蓝色荧光粉Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)与商品化的红绿两种荧光粉混合均匀后涂在365 nm的芯片上制成WLED,在20 mA的电流驱动下,得到的WLED相关色温为5679 K,色域可达95.3%NTSC((美国)国家电视标准委员会).
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 Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+)was prepared by high temperature solid state method,and its structure and properties were characterized and calculated.By using the density functional theory(DFT),Ba_(3)Y_(2)B_(6)O_(15) 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 Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)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 ^(3)P_(1)→^(1)S_(0) transition of Bi^(3+)ions.The emission spectra of Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)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 Ba_(3)Y_(2)B_(6)O_(15).Under the 365 nm UV radiation,the Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)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 Ba_(3)Y_(2)B_(6)O_(15) matrix.The photoluminescence(PL)intensity of Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)remains 73.9% of the initial intensity at 150℃,and there is almost no color drift.The thermal quenching activation energy(Ea)of Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)was calculated to be 0.290 eV by the Arrhenius Equation,which indicates that Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)has high thermal stability.When Y3+is partially substituted by Sc^(3+),the emission spectrum of Ba_(3)Sc_(x)Y_(2-x)B_(6)O_(15):Bi^(3+)(0≤x≤1.6)is redshifted with the increase of x.Finally,the blue phosphor Ba_(3)Y_(2)B_(6)O_(15):0.5%Bi^(3+)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 Ba_(3)Y_(2)B_(6)O_(15):Bi^(3+)is a promising phosphor for high-performance LCD backlights.