The structure and photoluminescence of CH3NH3PbI3 (lead triiodide methylammonium) synthesized perovskite crystals are investigated in a wide temperature range. As temperature rises to 130–140 K, there is a junction from an orthorhombic to tetragonal crystal lattice with a change in the bandwidth. An increase in the stationary photoluminescence intensity at room temperature under the influence of exciting emission is revealed. A model explaining the observed growth of photoluminescence is proposed.

中文翻译：

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混合钙钛矿晶体的结构和光电特性

在宽温度范围内研究了 CH3NH3PbI3（三碘化铅甲基铵）合成的钙钛矿晶体的结构和光致发光。随着温度升高到 130-140 K，从正交晶格到四方晶格的结点会发生带宽变化。揭示了在激发发射的影响下室温下稳态光致发光强度的增加。提出了一个解释所观察到的光致发光增长的模型。