The photostability of hybrid organic-inorganic perovskites (HOIPs) is an important criterion due to unavoidability of light in photoelectric elements of solar cells, light emitting diodes (LEDs) or photo detectors. This research aims to explore the photostability of a compressed two-dimensional (2D) (PEA)2PbI4 crystal. The structural and compositional responses of the sample to laser illumination under pressure were recorded via in-situ photoluminescence (PL) spectroscopy and morphological analysis methods. The enhancement in laser endurance limit from 3 to 11 mW and long-duration photostablity were achieved along with structural self-healing in the recrystallized (PEA)2PbI4 sample. The robust stability of the material was ascribed to pressure-induced suppression of the nonradiative decay and grain boundary minimization in the rebirthed crystal. A similar result was also obtained in compressed (BA)2PbI4 and MAPbI3 crystals. Therefore, high pressure offers an effective and green method to improve the photostability of HOIP crystals and has a profound significance in the widespread application of HOIP-based photoelectric devices.

中文翻译：

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（PEA）2PbI4 钙钛矿通过压力诱导非晶化和再结晶实现的自修复和强大的光稳定性


杂化有机-无机钙钛矿 （HOIPs） 的光稳定性是一个重要标准，因为太阳能电池、发光二极管 （LED） 或光电探测器的光电元件中光不可避免。本研究旨在探索压缩二维 （2D） （PEA） 2PbI4 晶体的光稳定性。通过原位光致发光 （PL） 光谱和形态分析方法记录样品对压力下激光照射的结构和成分响应。在再结晶 （PEA）2PbI4 样品中实现了激光耐久极限从 3 到 11 mW 的增强和长时间的光稳定性以及结构自修复。该材料的稳健稳定性归因于重生晶体中非辐射衰变的压力诱导抑制和晶界最小化。在压缩 （BA）2PbI4 和 MAPbI3 晶体中也获得了类似的结果。因此，高压为提高 HOIP 晶体的光稳定性提供了一种有效的绿色方法，对基于 HOIP 的光电器件的广泛应用具有深远的意义。