近日，中国科学院大连化学物理研究所李灿团队研究了金属卤化物钙钛矿薄膜的摩擦发光。2025年11月6日出版的《光：科学与应用》杂志发表了这项成果。

金属卤化物钙钛矿（MHPs）具有光电转换、电致发光、光放大、铁电性和挠性等优异的性能，成为多种领域的通用材料。

研究组报告了以前未发现的MHP膜的性质，即：摩擦发光（TL），并阐明其潜在的机制。当MHP薄膜被费米能级低于MHP的特定材料（如Cu、Au、Pt）刮擦时，就会触发TL响应。摩擦诱导电子从MHP向刮刀转移，在MHP膜表面产生正静电场，静电斥力导致MHP晶格拉伸，从而增强荧光和载流子寿命。如果摩擦材料（如Al）具有较高的费米能级，则电子转移过程、静电场方向、晶格结构变化与之相反，导致荧光减弱。这项工作揭示了MHP膜的TL现象和独特的机制，为探索具有吸引力的MHP开辟了新的途径。

附：英文原文

Title: Triboluminescence of metal halide perovskite films

Author: Tian, Hao, Sun, Fengke, Chen, Jun, Sun, Fusai, Liu, Xiaotao, Li, Yang, Zhu, Zhanjun, Guo, Junxue, Zhou, Bo, Guo, Xin, Li, Can

Issue&Volume: 2025-11-06

Abstract: Metal halide perovskites (MHPs) have shown fantastic properties such as photoelectric conversion, electroluminescence, light amplification, ferroelectricity, and flexoelectricity, becoming versatile materials in diverse fields. Herein, we report a previously undiscovered nature of the MHP film, i.e. triboluminescence (TL), and elucidate its underlying mechanism. The TL response is triggered when an MHP film is scraped by specific materials (like Cu, Au, Pt) with a lower Fermi level than that of the MHP. The friction induces electron transfer from MHP to scraper, generating a positive electrostatic field on the surface of the MHP film, which leads to stretched MHP lattices owing to electrostatic repulsion, consequently enhancing fluorescence and charge carrier lifetime. If the friction material (like Al) has a higher Fermi level, electron transfer process, electrostatic field direction, and lattice structure change are just the opposite, resulting in reduced fluorescence. This work unveils the TL phenomenon of the MHP film and the unique mechanism, opening up new avenues for explorations on the appealing MHPs.

DOI: 10.1038/s41377-025-02032-4

Source: https://www.nature.com/articles/s41377-025-02032-4