摘要
近年来,钙钛矿量子点CsPbX_(3)(X=Cl,Br,I)稳定性较差的问题引起了广泛关注。本文在室温下合成了稳定的CsPbBr_(3)/Si_(3)N_(4)绿色荧光粉并将其应用于白光发光二极管(WLEDs)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、激发和发射光谱(PL、PLE)等分析测试手段对CsPbBr_(3)量子点和CsPbBr_(3)/Si_(3)N_(4)荧光粉的结构、形貌、元素组成及光谱特性等进行了分析对比。实验结果表明,CsPbBr_(3)/Si_(3)N_(4)绿色荧光粉的热稳定性、水稳定性、色稳定性均得到了显著提升。80℃时CsPbBr_(3)/Si_(3)N_(4)荧光粉的发光强度能保持初始发光强度的87.4%,水中浸没120 min后发光强度能保持初始发光强度的75.5%。CsPbBr_(3)/Si_(3)N_(4)复合材料的量子效率则由CsPbBr_3量子点粉体的15.4%提升至35.4%。将CsPbBr_(3)/Si_(3)N_(4)复合材料与K_(2)SiF_(6)∶Mn^(4+)红色荧光粉、InGaN基蓝光LED芯片封装制得的WLED器件色域为113.4%NTSC,流明效率达49.4 lm/W。
In recent years,the poor stability of perovskite quantum dots CsPbX_(3)(X=Cl,Br,I)has attracted extensive attention.In this paper,we synthesized stable CsPbBr_(3)/Si_(3)N_(4) green phosphors at room temperature and applied to white light emitting diodes(WLEDs).The structure,morphology,element composition and luminescent properties of CsPbBr3 and CsPbBr_(3)/Si_(3)N_(4) phosphors were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),excitation and emission spectra(PL,PLE).The thermal stability,water and color stability of CsPbBr_(3)/Si_(3)N_(4) green phosphor were obviously improved.The emission intensity of CsPbBr_(3)/Si_(3)N_(4) phosphor can maintain 87.4%of the initial emission intensity at 80℃,and maintain 75.5%of the initial emission intensity after being immersed in deionized water for 120 min.The quantum efficiency of CsPbBr3/Si3N4 composite is increased from 15.4%of CsPbBr3 quantum dots powder to 35.4%.By packing the CsPbBr_(3)/Si_(3)N_(4) phosphor with K_(2)SiF_(6)∶Mn^(4+) red phosphor and InGaN based blue LED chip,the color gamut of the WLED device is 113.4%NTSC and the luminous efficiency is 49.4 lm/W.
作者
徐范范
聂文东
尧利钦
何盛安
陈广
叶信宇
XU Fan-fan;NIE Wen-dong;YAO Li-qin;HE Sheng-an;CHEN Guang;YE Xin-yu(Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Rare Earth,Jiangxi University of Science and Technology,Ganzhou 341000,China;Key Laboratory of Rare Earth Luminescence Materials and Devices of Jiangxi Province,Ganzhou 341000,China;China National Engineering Research Center for Ionic Rare Earth,Ganzhou 341000,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2021年第6期829-837,共9页
Chinese Journal of Luminescence
基金
国家自然科学基金(51962005)
江西省自然科学基金(20192BAB206010)
江西省井冈市青年学者奖励计划([2018]82)资助项目。
