AbstractHybrid organic‐inorganic perovskites (HOIP) due to their excellent optoelectronic properties and flexible structure have attracted enthusiastic interest. In particular, introducing chirality is a method to enhance compound performance. Herein, we report a multifunctional compound: (3APr)PbBr4 (1) (3APr=3‐Pyrrolidinamine) and corresponding enantiomer R and S‐(3APr)PbBr4 (R/S‐2). Compound 1 show reversible solid‐state phase transition, step‐like dielectric anomaly and broadband yellow emission under uv light excitation. Accompany with phase transition, structure dimension transition from 2D to 1D without space group change. Through introduce chirality, the R/S‐2 display mirror image 1D structural relationship, increased quantum yield from 3.43 % (1) to 13.65 % (R/S‐2) and exhibits corresponding CD signals. Then combine to first‐principles analysis, it was found that fluorescence is attributed to the formation of instantaneous defects during excitation, leading to the formation of self‐trapped excitons (STEs). This finding will further promote the development of multifunctional compound and the study of chiral substitution enhance compound properties.
摘要杂化有机-无机包覆晶石(HOIP)因其优异的光电性能和灵活的结构而备受关注。其中,引入手性是提高化合物性能的一种方法。在此,我们报告了一种多功能化合物:(3APr)PbBr4 (1) (3APr=3-吡咯烷胺)以及相应的对映体 R 和 S-(3APr)PbBr4 (R/S-2)。化合物 1 在紫外光激发下显示出可逆固态相变、阶梯状介电异常和宽带黄色发射。伴随着相变,化合物的结构尺寸也从二维转变为一维,且没有空间群变化。通过引入手性,R/S-2 显示出镜像一维结构关系,量子产率从 3.43 %(1)提高到 13.65 %(R/S-2),并显示出相应的光盘信号。然后结合第一原理分析发现,荧光是由于激发过程中瞬时缺陷的形成,导致自俘获激子(STE)的形成。这一发现将进一步促进多功能化合物的开发和手性取代增强化合物性能的研究。