文献类型：期刊文献

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

作者：Geng, Ting[1];Shi, Yue[1];Liu, Zhun[2];Zhao, Dianlong[1];Ma, Zhiwei[1];Wang, Kai[1];Dong, Qingfeng[3];Xiao, Guanjun[1];Zou, Bo[1]

机构：[1]Jilin Univ, Coll Phys, State Key Lab Superhard Mat, Changchun 130012, Peoples R China;[2]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[3]Jilin Univ, Coll Chem, State Key Lab Supermol Struct & Mat, Changchun 130012, Peoples R China

年份：2022

卷号：13

期号：50

起止页码：11837

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY LETTERS

收录：SCI-EXPANDED(收录号：WOS:000905284000001)、、EI(收录号：20225213289057)、Scopus(收录号：2-s2.0-85144366447)、WOS

基金：This work is supported by the National Key R&D Program of China (2019YFE0120300) , the National Science Foundation of China (12174144, 21725304, and 12174146) , the Jilin Provincial Science & Technology Development Program (20220101002JC) , the China Postdoctoral Science Founda- tion (2021M690065) , the Interdisciplinary Integration and Innovation Project of JLU (JLUXKJC2021QZ12) , and the Graduate Innovation Fund of Jilin University (2022025) . This work was mainly performed at BL15U1 at the Shanghai Synchrotron Radiation Facility (SSRF) . Portions of this work were performed at 4W2HP-Station, Beijing Synchrotron Radiation Facility (BSRF) .

语种：英文

外文关键词：Annihilation - Bismuth compounds - Chlorine compounds - Electron correlations - Electron-phonon interactions - Energy transfer - Excitons - Lead compounds - Lighting - Metal halides - Optical properties - Perovskite

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