为提高CsPbBr3钙钛矿量子点稳定性并实现具有优良发光性能量子点固体材料的制备, 采用高温熔融方法成功地在硼硅酸盐微晶内部制备了CsPbBr3量子点, 得到CsPbBr3量子点微晶。通过SEM扫描电镜测试分析量子点微晶的形貌特征; 通过荧光光谱、CIE色度坐标分析其荧光特性。SEM扫描电镜测试结果表明, 在微晶表面及内部均匀分布着粒径为10 nm左右的CsPbBr3量子点, 实现了硼硅酸盐微晶对CsPbBr3量子点的有效包覆。荧光光谱测试表明, CsPbBr3量子点微晶表现出宽的激发光谱, 且可以在360 nm波长紫外光激发下实现较强的517 nm绿光发射。发射光谱及CIE坐标表明在400 ℃高温环境下该CsPbBr3量子点微晶材料仍能保持优异的光学性能。该量子点微晶材料的成功制备为钙钛矿材料在新型固体发光材料领域的发展提供了可能性。

In order to improve the stability of CsPbBr3 perovskite quantum dots and realize the preparation of solid quantum dot materials with excellent luminescence properties, CsPbBr3 quantum dots were successfully prepared in the borosilicate microcrystals by high temperature melting method to obtain CsPbBr3 quantum dot microcrystals. The particle morphology of the microcrystals was tested by scanning electron microscopy(SEM). The fluorescence characteristics were analyzed by fluorescence spectroscopy and CIE chromaticity coordinates. SEM images show that CsPbBr3 quantum dots with a particle size of about 10 nm are uniformly distributed on the surface and inside of the microcrystals, and the effective coating of CsPbBr3 quantum dots by borosilicate microcrystals was realized. Fluorescence spectroscopy tests show that CsPbBr3 quantum dot microcrystals exhibit a broad excitation spectrum and can achieve strong 517 nm green emission at 360 nm wavelength excitation. The emission spectra and CIE coordinates indicate that the CsPbBr3 quantum dot microcrystals can maintain excellent optical properties at 400 ℃. The successful preparation of the quantum dot microcrystalline material provides the possibility for the development of perovskite materials in the field of new solid luminescent materials.