Pressure‐Induced Conformation Transition and Chiral Inversion Toward Enhanced Bright White Light From 1D Chiral Perovskite
Yue Wang, Xihan Yu, Jiayi Yang, Xuening Sun, Yongguang Li, Kai Wang, Guanjun Xiao, Bo Zou
Abstract
Abstract The introduction of chiral molecules can impart chirality to low‐dimensional perovskite, thereby enhancing its potential in chiral sensing and information storage applications. Nevertheless, the limited photoluminescence efficiency greatly restricts its broader utility. Here, a very bright white light is achieved from the pressure‐induced emission (PIE) of 1D chiral OIHPs S‐C 6 H 5 CH(CH 3 )NH 3 PbBr 3 (S‐MPAPbBr 3 ) crystal, which exhibited a 24.6‐fold increase in emission intensity. The circular dichroism (CD) spectrum exhibited simultaneous chiral inversion and enhancement, establishing it as a multifunctional material from PIE luminogens (PIEgens). Furthermore, upon releasing pressure to the ambient conditions, the bright white light emission can be stabilized with the Commission Internationale de l’Éclair‐age (CIE) chromaticity coordinates of (0.30, 0.29) and a correlated color temperature (CCT) of 7998 K. In situ high‐pressure experiments and first‐principles calculations indicated that the pressure‐induced irreversible structural amorphization associated with the steric hindrance effect is responsible for the retention of cold‐white light. The conformation transition of S‐MPA + cations induced twisting of [PbBr 3 ] − ∞ chains, thus improving the PL efficiency and modulating the CD signal. The research elucidates the fundamental structure‐property relationship of low‐dimensional OIHPs and offers potential application of solid‐state lighting with single‐component white light as well as chiral regulation.