Affiliation:
1. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences 350002 Fuzhou Fujian China
2. Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China 350108 Fuzhou Fujian China
Abstract
AbstractBirefringent 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.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Key Research Program of Frontier Science, Chinese Academy of Sciences
Fujian Institute of Innovation, Chinese Academy of Sciences