Structural Origin of Enhanced Circularly Polarized Luminescence in Hybrid Manganese Bromides
Jian Chen, Shuai Zhang, Xin Pan, Ruiqian Li, Shi Ye, Anthony K. Cheetham, Lingling Mao
Abstract
Abstract Chiral hybrid metal halides with a high dissymmetry factor ( g lum ) and a superior photoluminescence quantum yield (PLQY) are promising candidates for circularly polarized luminescence (CPL) light sources. Here, we report eight new chiral hybrid manganese halides, crystallizing in the non‐centrosymmetric space group P 2 1 2 1 2 1 and showing intense CPL emissions. Oppositely‐signed circular dichroism (CD) and CPL signals are detected according to the R ‐ and S ‐configurations of the chiral alkanolammonium cations. Time‐resolved PL spectra show long averaged decay lifetimes up to 1 ms for ( R ‐3‐quinuclidinol)MnBr 3 ( R ‐ 1 ). The g lum of polycrystalline samples for coordinated structures (23×10 −3 ) is more than doubled compared with the non‐coordinated ones (8.5×10 −3 ), due to the structural variations. R ‐ 1 exhibit both a high g lum and a high PLQY (50.2 %). The effective chirality transfer mechanism through coordination bonds, with strongly emissive Mn II centers, enables a new class of high‐performance CPL materials.