Sc_(2)O_(3)对CsPbBr_(3)量子点玻璃析晶行为的影响  

Influence of Sc_(2)O_(3)on Crystallization Behavior of CsPbBr_(3)Quantum Dot Glass

作　　者：李菊清 雷炳富 刘应亮 张学杰 王静[2] LI Juqing;LEI Bingfu;LIU Yingliang;ZHANG Xuejie;WANG Jing(College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China;School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]华南农业大学材料与能源学院,广州510642 [2]中山大学化学学院,广州510275

出　　处：《硅酸盐学报》2024年第12期3663-3672,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52372147,51802101)。

摘　　要：玻璃网络结构对玻璃中CsPbBr_(3)量子点的析晶行为及发光性质具有重要影响作用。通过高温熔融及后续热处理制备了一系列CsPbBr_(3)量子点玻璃,系统研究了Sc_(2)O_(3)引入量对CsPbBr_(3)量子点玻璃析晶行为及发光性能的影响。结果表明:Sc_(2)O_(3)作为一种玻璃网络中间体,添加至玻璃组分中可以有效增强玻璃网络结构,且随着引入量的增多,CsPbBr_(3)量子点析出尺寸逐渐减小。经优化,最佳CsPbBr_(3)量子点玻璃样品在460 nm激发下内、外量子效率高达62.98%及37.92%,该样品在455 nm蓝光发光二极管芯片上(20 V,20 m A)持续点亮7 d后依旧可以保持其原始发光强度的64.51%。上述优异的发光性能为其在宽色域背光显示领域中的应用奠定了基础。Introduction Cs Pb Br_(3)perovskite quantum dots are considered as excellent green light materials in the field of wide color gamut displays due to their excellent luminescence characteristics,such as high photoluminescence quantum yield(PLQY)and narrow full width at half maximum(FWHM).However,CsPbBr_(3)quantum dots irreversibly deteriorate when exposed to oxygen,water,light and heat due to their low formation energy and strong ionic properties,which restricts their application.The preparation of CsPbBr_(3)quantum dots via in-situ crystallization in glass is considered as one of the effective strategies to improve their stability.In this study,borosilicate glass was used as a matrix to investigate the effect of Sc_(2)O_(3)introduction on the glass network structure and the regulatory effect on the crystallization behavior and luminescence performance of CsPbBr_(3).In addition,the photostability and thermostability of the samples were analyzed.CsPbBr_(3)quantum dot glass powder with the high quantum efficiency and narrow FWHM could be used to prepare white LED with a high luminous efficiency and a wide color gamut.Methods A series of CsPbBr_(3)quantum dot glasses were prepared by a conventional melt quenching-heat treatment method.The specific molar composition ratio of the glass was 42B_(2)O_(3)–20SiO_(2)–4Li_(2)O–8Zn O–3Mg O–3Cs_(2)O–6Pb Br_(2)–6NaBr–x Sc_(2)O_(3)(mole fraction,x=0,0.1,0.3,0.5,and 0.7).According to the composition of each glass stoichiometric ratio,the raw materials were weighed,and fully ground in a mortar for 30 min.The mixed powder was then transferred to a corundum crucible and placed in a high-temperature muffle furnace at 1200℃ for 15 min.Subsequently,the melt was poured into a preheated graphite mold and annealed for 3 h to relieve thermal stress.After cooling to room temperature,a transparent precursor glass(referred to as PG)was obtained.CsPbBr_(3)quantum dot glass was obtained via heat treatment of precursor glass samples at different temperatures(i.e.,460,470,480,490

关 键 词：三溴化铅铯量子点 玻璃网络 组分调控 发光性能 

分 类 号：TQ171.1[化学工程—玻璃工业]