Preparation and Luminescence Properties of CsPbBr3 Perovskite Quantum Dot Microcrystals

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. © 2019, Science Press. All right reserved.