Circularly Polarized Luminescence Induced by Hydrogen‐Bonding Networks in a One‐Dimensional Hybrid Manganese(II) Chloride

Abstract

Chiral hybrid metal halides hold great potential as the circularly polarized luminescence light sources. Herein, we have obtained two enantiomeric pairs of one‐dimensional hybrid chiral‐manganese(II) chloride single crystals, R/S‐(3‐methyl piperidine)MnCl3 (R/S‐1) and R/S‐(3‐hydroxy piperidine)MnCl3 (R/S‐2), crystallizing in non‐centrosymmetric space group P212121. In comparison to R/S‐1, R/S‐2 single crystals not only show red emission with near‐unity photoluminescence quantum yield and high resistance to thermal quenching but also exhibit circularly polarized luminescence with an asymmetry factor (glum) of 2.5×10−3, which are attributed to the enhanced crystal rigidity resulting from the hydrogen bonding networks between R/S‐(3‐hydroxy piperidine) cations and [MnCl6]4‐ chains. The circularly polarized luminescence activities originate from the asymmetric [MnCl6]4‐ luminophores induced by the N‐H···Cl hydrogen bonding with R/S‐(3‐hydroxy piperidine). Moreover, these samples demonstrate great application potential in circularly polarized light‐emitting diodes and X‐ray scintillators. This work shows a highly efficient photoluminescent Mn‐based halide and offers a strategy for designing multifunctional chiral metal halides.