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DOI	10.1007/s10853-021-06022-w
	Effects of organic ligands on efficiency and stability of perovskite light-emitting diodes
	Zhang K.; Zhang M.; Zhu N.; Yin H.; Xing J.; Wang L.
发表日期	2021
ISSN	222461
起始页码	11436
结束页码	11447
卷号	56 期号:19
英文摘要	Perovskite light-emitting diodes (PeLEDs) have attracted considerable attention due to their low cost, high efficiency and narrowband emission. However, poor operational lifetime limits their practical application and the degradation mechanism is not yet clear. Herein, the effect of typical phenylalkylamine and alkylamine ligands on optoelectrical properties and operational stability of cesium/methylammonium lead bromide PeLEDs were systematically investigated. The phenylethylamine (PEA) modified PeLED shows a champion maximum external quantum efficiency (EQE) of 9.35%, which is much better than that of phenylmethylamine (PMA) and phenylbutylamine (PBA) modified devices. For alkylamine-based devices, the maximum EQEs gradually rise from 2.72 to 6.33% and 6.66% as increase of alkyl chain length. PEA modified device exhibits the best half-lifetime of 114 min and alkylamine-based devices exhibit almost equal T50 of approximately 20 min. X-ray diffraction measurements show that the dominant diffraction peaks of pervoskite films disappear or shift and scanning electron microscope detected that many pinholes appeared in perovskite films after operation. Combining with the results of X-ray photoelectron spectroscopy, we conclude that the recrystallization of perovskite occurred during the operation causes the film change in morphology and crystallinity, ultimately result in the degradation of PeLEDs. Graphical abstract: The effect of typical phenylalkylamine and alkylamine ligands on optoelectrical properties and operational stability of PeLEDs were systematically investigated. The phenylethylamine modified PeLED shows a champion maximum EQE of 9.35% and the best operational lifetime of 114 min. We concluded that the decomposition and recrystallization of perovskite occurred during the operation causes the film change in morphology and crystallinity, ultimately result in the degradation of PeLEDs. [Figure not available: see fulltext.]. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
scopus关键词	Cesium compounds; Crystallinity; Degradation; Efficiency; Lead compounds; Morphology; Perovskite; Photodegradation; Recrystallization (metallurgy); Scanning electron microscopy; X ray photoelectron spectroscopy; Alkyl chain lengths; Degradation mechanism; External quantum efficiency; Narrow-band emission; Operational lifetime; Operational stability; Optoelectrical properties; X-ray diffraction measurements; Ligands
来源期刊	Journal of Materials Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177172
作者单位	Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China; Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China
推荐引用方式 GB/T 7714	Zhang K.,Zhang M.,Zhu N.,et al. Effects of organic ligands on efficiency and stability of perovskite light-emitting diodes[J],2021,56(19).
APA	Zhang K.,Zhang M.,Zhu N.,Yin H.,Xing J.,&Wang L..(2021).Effects of organic ligands on efficiency and stability of perovskite light-emitting diodes.Journal of Materials Science,56(19).
MLA	Zhang K.,et al."Effects of organic ligands on efficiency and stability of perovskite light-emitting diodes".Journal of Materials Science 56.19(2021).