嵌入CsPbBr_(3)@ZnO量子点的高稳定聚合物薄膜  

Polymer Films with High Stability Embedded Within CsPbBr_(3)@ZnO Quantum Dots

作　　者：黄胜[1] 张辉[1] 李苑 徐文杰[1] 边策 高莎莎 彭敏 Huang Sheng;Zhang Hui;Li Yuan;Xu Wenjie;Bian Ce;Gao Shasha;Peng Min(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116 [2]浙江大学材料科学与工程学院,浙江杭州310058 [3]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《光学学报》2023年第22期274-282,共9页Acta Optica Sinica

基　　金：江苏省自然科学基金(BK20210494,BK20221124);国家自然科学基金(52204254,52303356);中央高校基本科研业务费专项资金(2022QN1010)。

摘　　要：为了提升铯铅溴(CsPbBr_(3))量子点(QDs)的稳定性,提出了一种新方法:在CsPbBr_(3)量子点表面原位包覆二乙基锌,使用高分子聚合物聚甲基丙烯酸甲酯进行封装,将表面与二乙基锌配位的量子点嵌入聚甲基丙烯酸甲酯中,并放入空气中将二乙基锌氧化为ZnO,获得性能稳定的氧化锌包覆CsPbBr_(3)量子点的聚甲基丙烯酸甲酯膜。所制备的量子点薄膜具有较好的水稳定性和光学特性,光致发光量子产率(PLQY)高达82.2%;在水中浸泡7 d后,荧光强度保持初始值的55.4%。随后,将所制备的绿光量子点薄膜与红色荧光粉和蓝光二极管进行集成,制备了白光发光器件,其显示白光色坐标为(0.32,0.34),色域覆盖度为127.18%的NTSC和色域覆盖度为94.96%的Rec.2020色域。Objective Perovskite quantum dots(PQDs)are widely employed in solar cells,LED displays,photodetectors,gas sensing,and other fields due to their high photoluminescence quantum yield,tunable wavelength,wide absorption range,and unique quantum limiting effect.However,their poor stability and easy degradation in environmental conditions limit the application.When PQDs are exposed to the air,the oxygen in the air will combine with the surface defects of perovskite,which is prone to form superoxygen electric pairs under light,causing cascade damage and rapid performance decay of perovskite.Furthermore,water and oxygen in the air easily result in degraded octahedral structure of PQDs,thus losing PQDs are emission performance and transforming into a non-emission state.Similarly,chemical degradation of PQDs occurs when PQDs are exposed to environmental conditions,and the surface organic amines absorb water,which can easily decrease their quantum yield.Since this limits the application of PQDs in the commercialization process,how to improve their stability has become an urgent problem to be solved.We synthesize ZnO-coated CsPbBr_(3)quantum dots(QDs)by a simple solution processing route and embed them in a polymethyl methacrylate polymer.ZnO coating and polymer packaging enhance the stability and degradability of CsPbBr_(3)QDs and they are applied to white light display devices.This co-passivation strategy of metal oxide coating and polymer encapsulation broadens the existing strategies to improve the QD stability and provides a new idea for practical applications of CsPbBr_(3)QDs.Methods Diethylzinc is in situ coated on the surface of CsPbBr_(3)QDs,and the polymer poly(methyl methacrylate,PMMA)is adopted for encapsulation.The QDs coordinated with diethylzinc on the surface are embedded into PMMA and then exposed to air to oxidize diethylzinc into ZnO,which brings a stable PMMA film with ZnO-coated CsPbBr_(3)QDs.Among them,we first characterize the structure of the synthesized CsPbBr_(3)QDs and the elemental characterizatio

关 键 词：量子光学 钙钛矿 量子点 包覆 聚甲基丙烯酸甲酯 二乙基锌 

分 类 号：O69[理学—化学]