三溴铅酸铯量子点（CsPbBr₃ QDs）由于具有高的荧光量子产率与窄的半高峰宽，其荧光波长可以覆盖整个可见光区。然而，目前大多数有机无机卤素钙钛矿量子点的水氧及热稳定性较差，通过改进的Stöber法直接在预先合成的13 nm CsPbBr₃ QDs表面包覆了一层无定型SiO₂层，成功制备了SiO₂包覆的CsPbBr₃ QDs （CsPbBr₃@SiO₂）。SiO₂包膜后形成了颗粒较大的聚集体，量子点在颗粒内被保护且均匀分散，其形状类似火龙果且量子产率高达80.9%。CsPbBr₃@SiO₂在升温至80℃后还能保持90.7%的PL强度，在紫外灯下持续照射120 h后，保持了95.1%的PL强度。CsPbBr₃@SiO₂复合量子点在水和乙醇气氛下均稳定，有利于制造白光发光二极管器件。

Due to high fluorescence quantum yield and narrow half-peak width,cesium lead tribromide (CsPbBr₃) perovskites quantum dots (QDs) has the fluorescence wavelengths covering the entire visible region.However,most of the organic-inorganic halide perovskite quantum dots have poor stabilities to water,oxygen and heat,which is an urgent problem to be solved.Thus,SiO₂-coated CsPbBr₃ QDs (CsPbBr₃@SiO₂) is prepared by modifying the surface of pre-synthesized 13 nm CsPbBr₃ QDs with an amorphous SiO₂ layer through the modified Stöber method.After being coated by SiO₂,a large aggregate of particles is formed,and the quantum dots are protected and uniformly dispersed inside the particles.The structure of CsPbBr₃@SiO₂ composite quantum dots is similar with a pitahaya and the final quantum yield is as high as 80.9%.CsPbBr₃@SiO₂ can maintain 90.7% of PL strength after heating to 80℃,and even maintains 95.1% of PL strength after 120 hours of continuous exposure to UV light.In addition,CsPbBr₃@SiO₂ composite quantum dots are stable in water and ethanol atmospheres,which facilitates the fabrication of white light-emitting diode devices.

卢秀瑾(1994-),女,硕士研究生,研究方向为钙钛矿量子点的稳定性,m18217596893@163.com