Huang Weiqi, Song Xianyu, Li Yanqiang, Zhou Yang, Xu Qianting, Song Yipeng, Wang Han, Li Minjuan, Zhao Sangen, Luo Junhua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, China.
Small. 2024 Mar;20(9):e2306158. doi: 10.1002/smll.202306158. Epub 2023 Oct 20.
Birefringent crystals have important applications in optoelectronics areas due to their ability to modulate and polarize light. Despite increasing discovery of the birefringence potential of new crystals, it remains a great challenge to optimize both birefringence and bandgap simultaneously. Herein, a 1D chain-like hybrid perovskite birefringent crystal designed by 3D-to-1D dimensional tailoring, (GAM) PbI ·H O (GAM = C N H ), is presented, showing enlarged birefringence of 0.49@550 nm and enlarged optical bandgap (2.48 eV). Consequently, the birefringent quality factor of (GAM) PbI ·H O is up to 2.8 times that of the template MAPbI . In particular, the birefringence is much larger than those of commercial birefringent crystals and surpasses that of the vast majority of hybrid perovskite known to date. Theoretical calculations reveal that the strongly anisotropic arrangement of (GAM) π-conjugated cations and ordered PbI octahedra contributes to the large birefringence and wide bandgap of (GAM) PbI ·H O. It is believed that this work will provide a new pathway toward the rational design and synthesis of hybrid perovskite birefringent crystals for compact wide-bandgap polarization dependent devices.
双折射晶体由于其调制和偏振光的能力，在光电子领域具有重要应用。尽管新晶体的双折射潜力不断被发现，但同时优化双折射和带隙仍然是一个巨大的挑战。在此，我们展示了一种通过三维到一维维度剪裁设计的一维链状杂化钙钛矿双折射晶体(GAM)PbI₃·H₂O(GAM = C₆N₂H₉)，其在550nm处的双折射增大至0.49，光学带隙也增大(2.48eV)。因此，(GAM)PbI₃·H₂O的双折射品质因数高达模板MAPbI₃的2.8倍。特别地，其双折射比商业双折射晶体大得多，并且超过了迄今为止已知的绝大多数杂化钙钛矿。理论计算表明，(GAM)π共轭阳离子的强各向异性排列和有序的PbI₆八面体有助于(GAM)PbI₃·H₂O产生大双折射和宽带隙。相信这项工作将为合理设计和合成用于紧凑型宽带隙偏振相关器件的杂化钙钛矿双折射晶体提供一条新途径。
