全无机钙钛矿纳米晶由于具有高量子产率、窄线宽和可见光全波段发光特性,在功能光学材料和光学器件等领域具有广阔的应用前景。本文在室温下通过液相沉淀法制备CsPbBr3钙钛矿纳米晶,研究了溶剂密度、极性和粘度对钙钛矿纳米晶的反应过程、晶体结构、微观形貌和光学性能的影响。结果表明,通过改变反应溶剂的密度可以实现CsPbBr3钙钛矿纳米晶在反应器上部、下部以及整个液相中的生长。溶剂的极性越大,制备的CsPbBr3钙钛矿纳米晶的结晶度越低、发光强度和稳定性越低。过高的溶剂粘度不利于高质量CsPbBr3钙钛矿纳米晶的制备。本文提出的多种溶剂下快速制备CsPbBr3纳米晶的方法有望进一步促进其在太阳能电池、激光器、光探测器以及发光二极管等领域的应用。

All inorganic perovskite nanocrystals have broad application prospects in functional optical materials and optical devices due to their high quantum yield, narrow line width and full band visible light emission characteristics. The effect of solvent density, polarity and viscosity on the reaction process, crystal structure, microstructure and optical properties of CsPbBr3 perovskite nanocrystals was studied in this work. The results show that the growth of CsPbBr3 perovskite nanocrystals in the upper, lower and whole liquid phase of the reactor can be realized by changing the density of the reaction solvent. The higher the polarity of the solvent, the lower the crystallinity, the lower the luminescence intensity and stability. High solvent viscosity is not conducive to the preparation of high quality CsPbBr3 perovskite nanocrystals. The method proposed in this paper is expected to further improve its application in solar cells, lasers, photodetectors and light-emitting diodes.