Wang Haiyan, Wang Qiaohe, Ning Mengxin, Li Sen, Xue Renzhong, Chen Peng, Li Zijiong
College of Physics and Electronic Engineering, Zhengzhou University of Light Industry Zhengzhou 450002 PR China
Henan Key Laboratory of Magnetoelectronic Information Functional Materials, Zhengzhou University of Light Industry Zhengzhou 450002 PR China.
RSC Adv. 2023 Jul 28;13(33):22886-22894. doi: 10.1039/d3ra02816j. eCollection 2023 Jul 26.
The environment-friendly synthesis and property modulation of two-dimensional organic-inorganic halide perovskite (2D OHP) single crystals with large sizes and high quality are important for the fabrication of optoelectric devices. In this work, plate-like and centimeter-size (BA)Pb(BrI) (BA = -butylammonium, : 0-1) single crystals with high crystallinity were synthesized the cooling crystallization method in a mixed HX (X: I, Br) acid aqueous solution. The synthesized samples were single-phase with homogenously distributed Br and I ions. The lattice structure and bandgap of (BA)Pb(BrI) were both finely tuned through halide alloying. Pure photoluminescence with unitary wavelength was obtained in the mixed-halide samples compared to those of monohalides (BA)PbI and (BA)PbBr. This is attributed to the structural homogeneity of the alloyed crystals. Moreover, the prepared (BA)Pb(BrI) samples showed higher photo and thermal stability for a long duration even with ion migration. This study will be an important reference for the fabrication and property modulation of 2D OHP-based light-emitting and other optoelectric devices.
尺寸大且质量高的二维有机-无机卤化物钙钛矿（2D OHP）单晶的环境友好合成及性能调控对于光电器件的制造至关重要。在这项工作中，通过在混合HX（X：I，Br）酸性水溶液中采用冷却结晶法合成了具有高结晶度的板状且厘米尺寸的（BA）Pb（BrI）（BA = 正丁基铵，：0 - 1）单晶。合成的样品为单相，Br和I离子均匀分布。通过卤化物合金化对（BA）Pb（BrI）的晶格结构和带隙进行了精细调控。与单卤化物（BA）PbI和（BA）PbBr相比，混合卤化物样品获得了单一波长的纯光致发光。这归因于合金化晶体的结构均匀性。此外，即使存在离子迁移，所制备的（BA）Pb（BrI）样品在长时间内仍表现出更高的光稳定性和热稳定性。该研究将为基于2D OHP的发光及其他光电器件的制造和性能调控提供重要参考。
