Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202311086
Keywords
Hybrid Halide Perovskites; Optical Anisotropy; Phase Transition
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This work reports the observation of heat switching birefringence in a 2D layered hybrid halide perovskite crystal. Structure analyses reveal the impact of heat-induced structure transition on birefringence. This discovery may contribute to the development of stimuli-responsive polarization optical devices.
Birefringent crystals that can switch light polarization have important applications in optoelectronics. In the last decades, birefringence is mostly optimized by chemical strategies. Recently, switching birefringence by physical means has attracted much attention. Here, this work reports the observation of heat switching birefringence in a 2D layered hybrid halide perovskite (C2N3H4)(2)PbCl4 ((C2N3H4)(+)=1,2,4-triazolium). This heat switching birefringence leads to a significant change in the interference color for the crystal plate under the illumination of orthogonal polarized light. Structure analyses reveal a heat dependent structure transition in (C2N3H4)(2)PbCl4, whose birefringence is switched by the change in the distortion degree of PbCl6 octahedron. This discovery may be beneficial to the further development of stimuli-responsive polarization optical devices.
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