纯无机钙钛矿材料CsPbX3的合成及表征

Synthesis and characterization of all inorganic perovskite material CsPbX3

采用室温过饱和溶液再结晶法,以纯无机物CsX和PbX2(X=Br,I)来合成纯无机钙钛矿材料CsPbX3(X=Br,I)。确定了室温过饱和溶液再结晶法制备CsPbX3的最佳反应条件为,最佳投料配比为CsX∶PbX2摩尔比为1∶1,油胺和油酸体积比为1∶2.5,合成CsPbBr3的最佳前驱液和正己烷体积比为为1∶25,而CsPbI3为1∶10。利用SEM和XRD分别对其进行组织形貌和结构进行表征。紫外吸收光谱结果显示,CsPbBr3钙钛矿在510~680 nm呈强吸收,CsPbI3吸收红移~770 nm。CsPbBr3和CsPbI3特征荧光发射峰分别在600和750 nm附近。

All inorganic perovskite material CsPbX3(X=Br,I)was synthesized from pure inorganic substances CsX and PbX2(X=Br,I)by a recrystallization method at room temperature supersaturated solution.The optimal reaction conditions for the preparation of CsPbX3 at room temperature with super-saturated solution recrystallization were determined.The best feeding ratios were CsX:PbX2 molar ratio of 1∶1 and oleylamine and oleic acid volume ratio of 1∶1,and the best volume ratio of precursor to hexane for synthesis of CsPbBr3 was 1∶25,while CsPbI3 was 1∶10.The morphology and structure were characterized by SEM and XRD,respectively.The results of UV absorption spectrum showed that CsPbBr3 perovskite showed strong absorption at 510 nm^680 nm,and CsPbI3 absorption redshifted^770 nm.The characteristic fluorescence emission peaks of CsPbBr3 and CsPbI3 were around 600 nm and 750 nm,respectively.