一步法制备CsPbBr3/Cs4PbBr6复合纳米晶及其荧光性能研究  

One-Step Preparation and Fluorescence Properties of CsPbBr3/Cs4PbBr6 Composite Nanocrystals

作　　者：陈婷 胡泽浩 徐彦乔 白日胜 江莞 江伟辉[1,2] 谢志翔 CHEN Ting;HU Zehao;XU Yanqiao;BAI Risheng;JIANG Wan;JIANG Weihui;XIE Zhixiang(School of Material Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333001,China;National Engineering Research Center for Domestic&Building Ceramics,Jingdezhen 333001,China;College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院,景德镇333001 [2]国家日用及建筑陶瓷工程技术研究中心,景德镇333001 [3]东华大学材料科学与工程学院,上海201620

出　　处：《人工晶体学报》2020年第2期252-258,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51432004,51774096);江西省自然科学基金(20181BAB216009);江西省教育厅基金项目(GJJ190705,GJJ190736);景德镇市科技局基金(20192GYZD008-15,20192GYZD008-18)。

摘　　要：通过一步法制备了全无机CsPbBr3/Cs4PbBr6钙钛矿复合纳米晶,采用X射线衍射仪(XRD)、透射电子显微镜(TEM)、紫外-可见分光光度计(UV-Vis)、荧光光谱仪(PL)对所制备的CsPbBr3/Cs4PbBr6复合纳米晶进行表征,并系统研究了一步法反应过程中反应温度、反应时间和Cs/Pb比对纳米晶的物相、形貌以及光学性能的影响规律。结果表明:所制备的样品为分散性较好、结晶度较高且呈立方块形貌的复合纳米晶,平均粒径约为20 nm。随反应温度升高以及反应时间延长,纳米晶的荧光强度呈先增加后减小的趋势;当反应温度为90℃、反应时间为30 min时,纳米晶的荧光性能最佳。此外,Cs/Pb比对纳米晶的物相组成和发光强度也具有较大的影响,随着Cs/Pb比增大,样品中Cs4PbBr6相含量逐渐增加,可对CsPbBr3纳米晶起到保护作用,因此样品的发光强度逐渐增强;当Cs/Pb=2:3时,样品的荧光强度达到最高值。然而,过大的Cs/Pb比例阻碍了CsPbBr3相的形成,造成了纳米晶荧光强度的降低。All-inorganic CsPbBr3/Cs4PbBr6 perovskite composite nanocrystals(NCs)have been successfully preparaed by one-step method.CsPbBr3/Cs4PbBr6 NCs were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),ultraviolet-visible spectroscopy(UV-Vis),and photoluminescene spectroscopy(PL).The effects of reaction temperature,reaction time and Cs/Pb ratios on the phase,morphology and optical properties of NCs were systematically studied.The results show that the samples are cube-like morphology with great dispersion and high crystallinity,and the size of the NCs is about 20 nm.The PL intensity of NCs could be significantly increase then decrease with the increase of the reaction temperature and reaction time,and the optimal reaction temperature and time is 90℃ and 30 min,respectively.Futhermore,the molar ratio of Cs/Pb exhibited a great influence on the phase composition and emission property of NCs.The relative content of Cs 4PbBr 6 phase gradually increases with the increase of Cs/Pb ratio,which could served as a protective layer for CsPbBr3,resulting in the increase of emission intensity.The flourescence intensity reaches the max value when Cs/Pb=2:3.However,excessive molar ratio of Cs/Pb induce the decrease of emission intensity due to the suppressed formation of CsPbBr3.

关 键 词：一步法 CsPbBr3 纳米晶 复合 荧光性能 

分 类 号：O471.1[理学—半导体物理] TB383[理学—物理]