Bulk Chiral Halide Perovskite Single Crystals for Active Circular Dichroism and Circularly Polarized Luminescence

Motivated by the
chirality research of the hybrid halide perovskite,
we reported the controllable growth of single crystals of (R)-, (S)-, and (R,S)-C6H5CH­(CH3)­NH3 (MBA)-based lead (Pb) halide perovskites. The crystal structures
were redetermined and further refined to clarify the previously ambiguous
crystal structure problems. We further investigated the chiral optical
properties of these single crystals including nonlinear optical (NLO)
properties and photoluminescence (PL) properties. The as-fabricated
(R)- and (S)-MBAPbBr3 single crystals not only show notable circular dichroism (CD) signals
in the absorption spectra but also exhibit obvious circularly polarized
luminescence (CPL) characteristics. The available chiral hybrid perovskite
single crystals open up the possibility to study these intrinsic chirality
properties for optoelectronic applications.

受杂化卤化物钙钛矿（hybrid halide perovskite）的手性（chirality）研究启发，我们报道了(R)-、(S)-及(R,S)-苄基甲基铵（C₆H₅CH(CH₃)NH₃，MBA）基铅卤化物钙钛矿单晶的可控制备。我们重新测定了其晶体结构并进行进一步精修，以厘清此前存在的晶体结构歧义问题。此外，我们还对这类单晶的手性光学性质展开了研究，涵盖非线性光学（NLO）性质与光致发光（PL）性质。所制备的(R)-与(S)-MBAPbBr₃单晶不仅在吸收光谱中呈现出显著的圆二色性（CD）信号，还表现出清晰的圆偏振发光（CPL）特性。此类可获得的手性杂化钙钛矿单晶，为探究这类本征手性性质以应用于光电领域提供了可能。