
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 ultraviolet light excitation. the R/S-2 display mirror image structural relationship, increases quantum yield and CD signal.
Abstract
Hybrid 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.