Pressure-Induced Emission from All-Inorganic Two-Dimensional Vacancy-Ordered Lead-Free Metal Halide Perovskite Nanocrystals

• DOI: 10.1021/acs.jpclett.2c03332
• Publication Date: 2022-12-15T14:46:59Z
• Authors: Ting Geng; Yue Shi; Zhun Liu; Dianlong Zhao; Zhiwei Ma; Kai Wang; Qingfeng Dong; Guanjun Xiao; Bo Zou
• Keywords: 01 natural sciences; 0104 chemical sciences

Although seeking an effective strategy for further improving their optical properties is a great challenge, two-dimensional (2D) halide perovskites have attracted significant amount of attention because performance. In this regard, the pressure-induced emission accompanied by remarkable pressure-enhanced achieved without phase transition in 2D vacancy-ordered perovskite Cs3Bi2Cl9 nanocrystals (NCs). Note that initial NCs possess extremely strong electron-phonon coupling, leading to easy annihilation trapped excitons phonon. Upon compression, pressure could effectively suppress phonon-assisted nonradiative decay and give rise intriguing from "0" "1". Both weakened coupling relaxed octahedral distortion benefiting structure contributed subsequent enhanced emission. This work not only elucidates underlying photophysical mechanism but also identifies engineering as robust means potential applications environmentally friendly solid-state lighting at extremes.