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DOI	10.1016/j.jcis.2020.12.094
	Excitons competition regulation via organic cation-site and halogen-site co-halogenation of (X-p-PEA)2Pb(Cl/Br)4 perovskites
	Ma L.; Zhou C.; Zhang H.; Sun Y.; Wang B.; Feng X.; Chu Y.; Wu Z.; Wang C.; Zhao G.
发表日期	2021
ISSN	219797
起始页码	494
结束页码	500
卷号	588
英文摘要	In this work, we report a family of co-halogenated two-dimensional hybrid perovskites (2DHPs) based on phenethylammonium lead halogen ((PEA)2Pb(Cl/Br)4) in which the organic cation-site (PEA) is substituted with halogen at the para-site, namely the formation of 4-halophenethylamine (X-p-PEA) (X = Cl, Br; p: para-site). The organic cations are regulated by introducing halogen ions at the para-site of the benzene ring to promote the structural distortion of the lead halide octahedral inorganic layer. Furthermore, (X-p-PEA) causes a shift in the energy band distribution of 2DHPs. In this case, the photoluminescence competition of free excitons (FEs) and self-trapped excitons (STEs) changes the microscopic relaxation process of excitons. In addition, we found that (Br-p-PEA) can increase the photoluminescence quantum yield (PLQY). At the same time, we regulate the halogen-site of perovskites from lead-chloride perovskites (LCPs) to lead bromine perovskites (LBPs), achieving emission from white light to blue light. Therefore, the co-halogenation regulation strategy of organic cation-site and halogen-site can effectively regulate the photoluminescence wavelength and improve the PLQY. This is of great significance for the development of perovskite materials with specific optoelectronic applications. © 2020 Elsevier Inc.
英文关键词	Co-halogenation; Excitons competition; Free exciton; Lead hybrid perovskites; Self-trapped exciton
scopus关键词	Chlorine compounds; Excitons; Halogenation; Lead compounds; Photoluminescence; Positive ions; Inorganic layers; Lead chlorides; Optoelectronic applications; Organic cations; Photoluminescence quantum yields; Photoluminescence wavelength; Self-trapped exciton; Structural distortions; Perovskite; 4 halophenethylamine; amine; benzene; bromine; cation; halide; halogen; lead chloride; perovskite; unclassified drug; Article; blue light; competition; halogenation; photoluminescence; priority journal; quantum yield; substitution reaction; white light
来源期刊	Journal of Colloid and Interface Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177199
作者单位	Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, National Demonstration Center for Experimental Chemistry & Chemical Engineering Education, School of Science, Tianjin University, Tianjin, 300354, China
推荐引用方式 GB/T 7714	Ma L.,Zhou C.,Zhang H.,et al. Excitons competition regulation via organic cation-site and halogen-site co-halogenation of (X-p-PEA)2Pb(Cl/Br)4 perovskites[J],2021,588.
APA	Ma L..,Zhou C..,Zhang H..,Sun Y..,Wang B..,...&Zhao G..(2021).Excitons competition regulation via organic cation-site and halogen-site co-halogenation of (X-p-PEA)2Pb(Cl/Br)4 perovskites.Journal of Colloid and Interface Science,588.
MLA	Ma L.,et al."Excitons competition regulation via organic cation-site and halogen-site co-halogenation of (X-p-PEA)2Pb(Cl/Br)4 perovskites".Journal of Colloid and Interface Science 588(2021).