配体及溶剂调控的CsPbBr_(3)/Cs_(4)PbBr_(6)/CsPb_(2)Br_(5)相变及其光学特性  

Ligand and Solvent-modulated CsPbBr_(3)/Cs_(4)PbBr_(6)/CsPb_(2)Br_(5) Phase Transition and Its Optical Properties

作　　者：郭衡 石林林 沈涛 张松 朱益志 GUO Heng;SHI Linlin;SHEN Tao;ZHANG Song;ZHU Yizhi(Department of Science,Taiyuan Institute of Technology,Taiyuan 030008,China;College of Physics and Optoelectronic Engineering,Taiyuan University of Technology,Taiyuan 030024,China;State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering,Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;The Center for Industrial Technology Innovation and Development of Bijie,Bijie 551700,China)

机构地区：[1]太原工业学院理学系,山西太原030008 [2]太原理工大学物理与光电工程学院,山西太原030024 [3]中国科学院光电技术研究所,微细加工光学技术国家重点实验室,四川成都610209 [4]毕节市产业科技创新发展中心,贵州毕节551700

出　　处：《发光学报》2025年第2期296-304,共9页Chinese Journal of Luminescence

基　　金：太原工业学院科研启动基金(2023LJ017,2023KJ055);山西省基础研究计划(202403021211010,202403021212181);国家自然科学基金(62204157,62205235).

摘　　要：作为一种具有广阔前景的新型材料,金属卤化物钙钛矿在光电子领域正冉冉升起,成为一颗耀眼的新星。本文采用传统的热注射法制备了三维CsPbBr_(3)钙钛矿纳米晶。通过向三维CsPbBr_(3)钙钛矿纳米晶添加配体或极性溶剂,实现了三维CsPbBr_(3)、零维Cs_(4)PbBr_(6)和二维CsPb_(2)Br_(5)之间的相变,并研究和比较了它们独特的光学性质。在紫外光的激发下,CsPbBr_(3)、CsPbBr_(3)@Cs_(4)PbBr_(6)、CsPbBr_(3)@CsPb_(2)Br_(5)均发出明亮的绿光,具有纳秒量级的荧光寿命。复合结构CsPbBr_(3)@Cs_(4)PbBr_(6)、CsPbBr_(3)@CsPb_(2)Br_(5)的荧光寿命与CsPbBr_(3)寿命几乎一致,表明CsPbBr_(3)@Cs_(4)PbBr_(6)和CsPbBr_(3)@CsPb_(2)Br_(5)复合物的发光均来自CsPbBr_(3)纳米晶。此外,添加配体使得CsPbBr_(3)转变到Cs_(4)PbBr_(6),极性溶剂水诱导CsPbBr_(3)到CsPb_(2)Br_(5)的相变也被证实。这项工作不仅为复合结构钙钛矿的制备提供了一种简便的方法,而且在一定程度上提供了铅卤钙钛矿在湿度环境中降解的知识。As a promising new material,metal halide perovskite is rising as a shining star in the field of optoelectronics.In this paper,3D CsPbBr_(3) perovskite nanocrystals were prepared by a conventional thermal injection method.The phase transitions between 3D CsPbBr_(3),0D Cs_(4)PbBr_(6),and 2D CsPb_(2)Br_(5) have been realized by adding ligands or polar solvents,and their unique optical properties were investigated and compared.Under UV excitation,CsPbBr_(3),CsPbBr_(3)@Cs_(4)PbBr_(6),and CsPbBr_(3)@CsPb_(2)Br_(5) all emit bright green light with fluorescence lifetime on the nanosecond scale.The fluorescence lifetime of the composite structures CsPbBr_(3)@Cs_(4)PbBr_(6) and CsPbBr_(3)@CsPb_(2)Br_(5) is almost the same as that of CsPbBr_(3),suggesting that the emission of the CsPbBr_(3)@Cs_(4)PbBr_(6) and CsPbBr_(3)@CsPb_(2)Br_(5) CsPbBr_(3)/Cs_(4)PbBr_(6)/CsPb_(2)Br_(5)complexes are all from CsPbBr_(3) nanocrystals.In addition,the addition of ligands enabled the transformation of CsPbBr_(3) to Cs_(4)PbBr_(6),and the polar solvent water-induced phase transition from CsPbBr_(3) to CsPb_(2)Br_(5) was also confirmed.This work not only provides a simple method for the preparation of composite structured perovskites,but also provides some knowledge about the degradation of lead-halide perovskites in humidity environment.

关 键 词：钙钛矿 维度 光学特性 相变 

分 类 号：O482.31[理学—固体物理]