Synthesis of centimeter-size two-dimensional hybrid perovskite single crystals with tunable, pure, and stable luminescence

Haiyan Wang; Qiaohe Wang; Mengxin Ning; Sen Li; Renzhong Xue; Peng Chen; Zijiong Li

doi:10.1039/d3ra02816j

Synthesis of centimeter-size two-dimensional hybrid perovskite single crystals with tunable, pure, and stable luminescence

RSC Adv. 2023 Jul 28;13(33):22886-22894. doi: 10.1039/d3ra02816j. eCollection 2023 Jul 26.

Authors

Haiyan Wang^{1

2}, Qiaohe Wang¹, Mengxin Ning¹, Sen Li¹, Renzhong Xue¹, Peng Chen¹, Zijiong Li¹

Affiliations

¹ College of Physics and Electronic Engineering, Zhengzhou University of Light Industry Zhengzhou 450002 PR China wanghaiyan@zzuli.edu.cn.
² Henan Key Laboratory of Magnetoelectronic Information Functional Materials, Zhengzhou University of Light Industry Zhengzhou 450002 PR China.

Abstract

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)₂Pb(Br_xI_1-x)₄ (BA = n-butylammonium, x: 0-1) single crystals with high crystallinity were synthesized via 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)₂Pb(Br_xI_1-x)₄ 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)₂PbI₄ and (BA)₂PbBr₄. This is attributed to the structural homogeneity of the alloyed crystals. Moreover, the prepared (BA)₂Pb(Br_xI_1-x)₄ 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.