Chiral 0D hybrid lead-bromide perovskites with strong nonlinear chiroptical properties

Abstract

Chiral optical materials enable simultaneous linear and nonlinear optical properties and have emerged as a new class of materials desirable for applications in chiroptical information technology. Herein, we developed two pairs of hybrid lead-bromide perovskites (R-/S-APD)PbBr₄ and (1R,2R-/1S,2S-DACH)2PbBr₆·2H₂O, and systematically investigated their linear and nonlinear chiroptical responses. Second-harmonic generation circular dichroism (SHG-CD) measurements reveal a high anisotropy factor (g_SHG-CD) of up to 1.58 for (1S,2S-DACH)₂PbBr₆·2H₂O, which is the highest value among those of the reported chiral perovskites to date. Notably, these perovskites display a high laser damage threshold (LDT) of up to 59.36 GW cm⁻². This study demonstrates that the 0D chiral hybrid lead-bromide perovskite system can simultaneously exhibit both high LDT and g_SHG-CD, thereby opening a new route for the design of high-performance chiral nonlinear optics.