全无机钙钛矿CsPbBr₃相对于有机无机杂化钙钛矿而言，在保留了例如较大的光学增益，较长的载流子寿命，较低的缺陷密度等优点的基础上，利用无机离子替代不稳定的有机基团，使材料具有相对更好的稳定性，其在高能探测器、半导体激光器等领域展现出了很大的发展潜力。本课题旨在探究钙钛矿纳米片的生长、表征及光学性质，实验研究了CsPbBr₃纳米片的生长条件、形貌及静压下光学性质的变化。实验表明钙钛矿纳米片的生长与反应温度，时间和沉积温度都有关，得到的纳米片的边长在5到10微米之间，在光学显微镜下主要呈现为粉色和绿色。利用金刚石压砧作为施加压力的工具，用硅油作为传导压力的介质，用红宝石标定压力的具体数值，实验表明随着压力逐渐增大，CsPbBr₃的PL峰和激射峰峰位先发生红移，再发生蓝移，且发光强度逐渐减弱。该结果可归因于在高压下CsPbBr₃晶格的键长收缩和PbBr₆八面体结构的畸变，同时压力导致材料经历非晶化，从而非辐射复合过程增强，使得发光强度减弱。

Compared with organic-inorganic hybrid perovskite, the all-inorganic perovskite CsPbBr₃ uses inorganic ions on the basis of retaining advantages such as greater optical gain, longer carrier lifetime, and lower defect density. Instead of unstable organic groups, the material has relatively better stability, and it has shown great development potential in high-energy detectors, semiconductor lasers and other fields. The purpose of this topic is to explore the growth, characterization and optical properties of perovskite nanosheets, and experimentally study the growth conditions, morphology and optical properties of CsPbBr₃ nanosheets under static pressure. Experiments show that the growth of perovskite nanosheets is related to the reaction temperature, time and deposition temperature. The side length of the obtained nanosheets is between 5 and 10 microns, and they are mainly pink and green under an optical microscope. The diamond anvil is used as a pressure tool, silicon oil is used as the pressure transmission medium, and the specific value of the pressure is calibrated with ruby. The experiment shows that as the pressure gradually increases, the PL peak and the lasing peak of CsPbBr₃ will be red-shifted first. The blue shift occurs again, and the luminous intensity gradually decreases. This result can be attributed to the bond length contraction of the CsPbBr₃ lattice and the distortion of the PbBr₆ octahedral structure under high pressure. At the same time, the pressure causes the material to undergo amorphization, thereby enhancing the non-radiative recombination process and reducing the luminous intensity.