A Two-Dimensional Hybrid Perovskite With Heat Switching Birefringence |
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Authors: | Ziyi Wang Xu Chen Yipeng Song Zhipeng Du Yang Zhou Minjuan Li Weiqi Huang Qianting Xu Yanqiang Li Sangen Zhao Junhua Luo |
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Institution: | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002 Fuzhou, Fujian, China |
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Abstract: | 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)2PbCl4 ((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)2PbCl4, 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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Keywords: | Hybrid Halide Perovskites Optical Anisotropy Phase Transition |
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