美国加州大学伯克利分校Peidong Yang研究团队的一项最新研究，提出具有近统一光致发光的蓝绿卤化物钙钛矿的超分子组装。相关论文于2024年1月5日发表于国际顶尖学术期刊《科学》杂志上。

在这项工作中，该课题组展示了用超分子组装的卤化铪(Hf)和卤化锆(Zr)八面体晶体，可实现接近统一的光致发光量子产率(PLQY)的蓝色和绿色发射。(18C6@K)₂HfBr₆粉末呈现蓝色发光，PLQY接近统一(96.2%)，(18C6@K)₂ZrCl₄Br₂粉末也呈现绿色发光，PLQY为82.7%。

这些高发射性粉末具有易于低温溶液合成的特点，并在环境条件下在可溶液加工的半导体油墨中保持高PLQY，因而它们被用于薄膜显示器和具有高空间分辨率的发射性三维印刷架构。

据了解，金属卤化物离子八面体是卤化物钙钛矿的光电单元，冠醚辅助的超分子组装方法可以将各种离子八面体包装成可调的对称性。

附：英文原文

Title: Supramolecular assembly of blue and green halide perovskites with near-unity photoluminescence

Author: Cheng Zhu, Jianbo Jin, Zhen Wang, Zhenpeng Xu, Maria C. Folgueras, Yuxin Jiang, Can B. Uzundal, Han K. D. Le, Feng Wang, Xiaoyu (Rayne) Zheng, Peidong Yang

Issue&Volume: 2024-01-05

Abstract: The metal-halide ionic octahedron is the optoelectronic unit for halide perovskites, and a crown ether–assisted supramolecular assembly approach can pack various ionic octahedra into tunable symmetries. In this work, we demonstrate near-unity photoluminescence quantum yield (PLQY) blue and green emission with the supramolecular assembly of hafnium (Hf) and zirconium (Zr) halide octahedral clusters. (18C6@K)2HfBr6 powders showed blue emission with a near-unity PLQY (96.2%), and green emission was also achieved with (18C6@K)2ZrCl4Br2 powders at a PLQY of 82.7%. These highly emissive powders feature facile low-temperature solution-based synthesis conditions and maintain high PLQY in solution-processable semiconductor inks under ambient conditions, and they were used in thin-film displays and emissive three-dimensional–printed architectures that exhibited high spatial resolution.

DOI: adi4196

Source: https://www.science.org/doi/10.1126/science.adi4196