Enhanced photoluminescence stability and internal defect evolution of the all-inorganic lead-free CsEuCl3 perovskite nanocrystals

doi:10.1039/d2cp01374f

	Enhanced photoluminescence stability and internal defect evolution of the all-inorganic lead-free CsEuCl3 perovskite nanocrystals
	Gao, Yalei 2,3; Zhang, Tao 2,3; Liu, Jun 2,3; Liu, Hongjun 2,3; Li, Meixian 2,3; Liu, Fuchi 2,3; Kong, Wenjie 2,3; Lv, Fengzhen 2,3; Yang, Yong 1,2,3; Long, Lizhen 2,3
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2022-08-10
卷号	24
ISSN号	1463-9076
DOI	10.1039/d2cp01374f
通讯作者	Liu, Jun(liujun719@163.com) ; Yang, Yong(yyanglab@issp.ac.cn) ; Long, Lizhen(longlzh@foxmail.com)
英文摘要	Perovskite materials are prominent candidates for many high-performance optoelectronic devices. The rare-earth lead-free CsEuCl3 perovskite nanocrystals are extremely unstable, which makes it very difficult to study their physicochemical properties and applications. Herein, we improved the stability of rare-earth based CsEuCl3 nanocrystals by employing a silica-coating for the first time. Simultaneously, the naturally formed "hollow" regions with an obviously blue-shifted PL emission were first observed inside the CsEuCl3 nanocrystals during the period of storage. Density functional theory (DFT) calculations showed that the formed "hollow" regions are due to the internal defect evolution in the perovskite lattice, which is also responsible for the increase of the bandgap and the blue-shift of emission. Additionally, the rapid decline of luminescence is probably due to the nanocrystals' final cracking with the expansion of the "hollow" regions. This work helps to understand the relationship between defects and luminescence properties, and provides guidance for the design of more stable lead-free perovskite nanocrystals.
资助项目	Natural Science Foundation of Guangxi[AD19245046] ; Natural Science Foundation of Guangxi[AD19245028] ; Natural Science Foundation of Guangxi[2020GXNSFBA297064] ; Natural Science Foundation of Guangxi[2018GXNSFAA294021] ; Natural Science Foundation of Guangxi[2022GXNSFAA035487] ; National Natural Science Foundation of China[11664003] ; National Natural Science Foundation of China[114744285]
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000834517800001
资助机构	Natural Science Foundation of Guangxi ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/132145]
专题	中国科学院合肥物质科学研究院
通讯作者	Liu, Jun; Yang, Yong; Long, Lizhen
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 2.Guangxi Normal Univ, Guangxi Key Lab Nucl Phys & Technol, Guilin 541004, Peoples R China 3.Guangxi Normal Univ, Sch Phys Sci & Technol, Guilin 541004, Peoples R China
推荐引用方式 GB/T 7714	Gao, Yalei,Zhang, Tao,Liu, Jun,et al. Enhanced photoluminescence stability and internal defect evolution of the all-inorganic lead-free CsEuCl3 perovskite nanocrystals[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2022,24.
APA	Gao, Yalei.,Zhang, Tao.,Liu, Jun.,Liu, Hongjun.,Li, Meixian.,...&Long, Lizhen.(2022).Enhanced photoluminescence stability and internal defect evolution of the all-inorganic lead-free CsEuCl3 perovskite nanocrystals.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,24.
MLA	Gao, Yalei,et al."Enhanced photoluminescence stability and internal defect evolution of the all-inorganic lead-free CsEuCl3 perovskite nanocrystals".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 24(2022).