Impeding anion exchange to improve composition stability of CsPbX3（X= Cl, Br） nanocrystals through facilely fabricated Cs4Pb6 shell  

作　　者：Zhaohui Shen Pengjie Song Bo Qiao Jingyue Cao Qiongyu Bai DANDan Song Zheng Xu Suling Zhao Gaoqian Zhang Yuanjun Wu 申朝晖;宋鹏杰;乔泊;曹靖玥;白琼宇;宋丹丹;徐征;赵谡玲;张高倩;吴元均(Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),Ministry of Education,Beijing 100044,China;Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing 100044,China;Shenzhen China Star Optoelectronics Technology Co,,Ltd,,Shenzhen 518132,China)

机构地区：[1]Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University),Ministry of Education,Beijing 100044,China [2]Institute of Optoelectronics Technology,Beijing Jiaotong University,Beijing 100044,China [3]Shenzhen China Star Optoelectronics Technology Co,,Ltd,,Shenzhen 518132,China

出　　处：《Chinese Physics B》2019年第8期246-249,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11474018,61704007,and 61575019);the National Key Research and Development Program of China(Grant No.2017YFB0404501);the Fundamental Research Funds for the Central Universities,China(Grant No.2017RC034);the Shenzhen China Star Optoelectronics Technology Co.,Ltd

摘　　要：Inorganic lead halide perovskite nanocrystals(NCs)with superior photoelectric properties are expected to have excellent performance in many fields.However,the anion exchange changes their features and is unfavorable for their applications in many fields.Hence,impeding anion exchange is important for improving the composition stability of inorganic lead halide perovskite NCs.Herein,CsPb X3(X=Cl,Br)NCs are coated with Cs4PbX6 shell to impede anion exchange and reduce anion mobility.The Cs4PbX6 shell is facily fabricated on CsPbX3 NCs through high temperature injection method.Anion exchange experiments demonstrate that the Cs4 PbX6 shell completely encapsulates CsPbX3 NCs and greatly improves the composition stability of CsPbX3 NCs.Moreover,our work also sheds light on the potential design approaches of various heterostructures to expand the application of CsPbM3(M=Cl,Br,I)NCs.Inorganic lead halide perovskite nanocrystals（NCs） with superior photoelectric properties are expected to have excellent performance in many fields. However, the anion exchange changes their features and is unfavorable for their applications in many fields. Hence, impeding anion exchange is important for improving the composition stability of inorganic lead halide perovskite NCs. Herein, CsPb X3（X = Cl, Br） NCs are coated with Cs4PbX6 shell to impede anion exchange and reduce anion mobility. The Cs4PbX6 shell is facily fabricated on CsPbX3 NCs through high temperature injection method.Anion exchange experiments demonstrate that the Cs4 PbX6 shell completely encapsulates CsPbX3 NCs and greatly improves the composition stability of CsPbX3 NCs. Moreover, our work also sheds light on the potential design approaches of various heterostructures to expand the application of CsPbM3（M = Cl, Br, I） NCs.

关 键 词：CsPbX3@Cs4PbX6 ANION exchange COMPOSITION STABILITY CORE-SHELL constructure 

分 类 号：O4[理学—物理]