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DOI	10.1002/adom.202001647
	Elucidating the Structure and Photophysics of Layered Perovskites through Cation Fluorination
	Tekelenburg E.K.; Kahmann S.; Kamminga M.E.; Blake G.R.; Loi M.A.
发表日期	2021
ISSN	21951071
英文摘要	Optoelectronic devices based on layered perovskites containing fluorinated cations display a well-documented improved stability and enhanced performance over non-fluorinated cations. The effect of fluorination on the crystal structure and photophysics, however, has received limited attention up until now. Here, 3-fluorophenethylammonium lead iodide ((3-FPEA)2PbI4) single crystals are investigated and their properties to the non-fluorinated ((PEA)2PbI4) variant are compared. The bulkier 3-FPEA cation increases the distortion of the inorganic layers, resulting in a blue-shifted absorbance and photoluminescence. Temperature-dependent photoluminescence spectroscopy reveals an intricate exciton substructure in both cases. The fluorinated variant shows hot-exciton resonances separated by 12 to 15 meV, values that are much smaller than the 40 to 46 meV found for (PEA)2PbI4. In addition, high-resolution spectra show that the emission at lower energies consists of a substructure, previously thought to be a single line. With the analysis on the resolved photoluminescence, a vibronic progression is excluded as the origin of the emission at lower energies. Instead, part of the excitonic substructure is proposed to originate from bound excitons. This work furthers the understanding of the photophysics of layered perovskites that has been heavily debated lately. © 2021 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH
英文关键词	crystal substructure; fluorinated cations; layered perovskites; luminescence spectroscopy; photophysics; Ruddlesden–Popper phase; single crystals
来源期刊	Advanced Optical Materials
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177300
作者单位	Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, 9747 AG, Netherlands; Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, Copenhagen Ø, DK-2100, Denmark
推荐引用方式 GB/T 7714	Tekelenburg E.K.,Kahmann S.,Kamminga M.E.,et al. Elucidating the Structure and Photophysics of Layered Perovskites through Cation Fluorination[J],2021.
APA	Tekelenburg E.K.,Kahmann S.,Kamminga M.E.,Blake G.R.,&Loi M.A..(2021).Elucidating the Structure and Photophysics of Layered Perovskites through Cation Fluorination.Advanced Optical Materials.
MLA	Tekelenburg E.K.,et al."Elucidating the Structure and Photophysics of Layered Perovskites through Cation Fluorination".Advanced Optical Materials (2021).