Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

作     者：Xin Lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao Xiangxing Xu Xin Lv;Gaoyu Chen;Xia Zhu;Jiakun An;Jianchun Bao;Xiangxing Xu

作者机构：Jiangsu Key Laboratory of Biofunctional MaterialsJiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第8期

页      面：7590-7596页

核心收录：

学科分类：07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：the National Natural Science Foundation of China(Nos.21871143 22175095 and 22075147). 

主　　题：all-inorganic perovskite nanocrystals anion exchange ternary phase diagram 

摘      要：All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic fields.Their properties can be feasibly tuned by the ratio of different halide ions.Post-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0yδor 3−δ y3).To date,little has been known on the phase diagram of the ternary halide perovskite of CsPbCl_(a)Br_(b)I_(3−a−b)(0a+b3).In this work,the ternary halide perovskite phase diagram is constructed by the strategy of halide anion exchange between perovskite NCs.From the diagram,the composition and proportion of the perovskite NC final phases from any starting perovskite NC mixture can be calculated.Specifically,a two-phase perovskite NC system showing stable dual photoluminescence(PL)peaks is achieved.