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混合阳离子钙钛矿的高效率绿色发光器件

Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites

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摘要

有机-无机金属卤化物钙钛矿材料具有可溶液加工性、良好色纯度和发光波长易调节等优点,易于制备低成本高分辨率的发光显示器件。研究了包含甲基胺(MA +)和乙基胺(EA +)的混合阳离子钙钛矿材料,其发光波长可以通过改变MA +和EA +的比例进行调节。混合EA +可以显著降低材料缺陷态密度,提高发光量子产率和光稳定性。采用该材料制备的绿光器件的最大外量子效率为7.7%,功率效率为25.1 lm·W -1,分别为MAPbBr3器件的1.9倍和1.7倍,器件稳定性有一定程度的提高。

Abstract

Organic-inorganic lead halide perovskites are intensively studied for their large potential in low-cost and high-resolution light-emitting devices due to the advantages of solution-processability, good color purity, and facile emission wavelength tunability. We study the perovskite materials containing a mixture of methylammonium (MA +) and ethylammonium cations (EA +), which show the cation-ratio dependent emission wavelength. Introduction of EA + cations increases the photoluminescence quantum yield and photo-stability simultaneously, reduces the density of defect states significantly. Related green-emitting devices show a maximum external quantum efficiency and power efficiency of 7.7% and 25.1 lm·W -1, which are 1.9 and 1.7 times as those of the MAPbBr3-based analogs, respectively, along with improved operational stability.

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中图分类号:O469

DOI:10.3788/AOS201939.1016002

所属栏目:材料

基金项目:国家自然科学基金;

收稿日期:2019-04-28

修改稿日期:2019-06-25

网络出版日期:2019-10-01

作者单位    点击查看

杨晓晖:西南大学物理科学与技术学院, 重庆 400715
王琦:西南大学物理科学与技术学院, 重庆 400715
肖择武:西南大学物理科学与技术学院, 重庆 400715
吴小龑:中国工程物理研究院流体物理研究所, 四川 绵阳 621900
任杰:西南大学物理科学与技术学院, 重庆 400715
吴燕婷:西南大学物理科学与技术学院, 重庆 400715

联系人作者:杨晓晖(xhyang@swu.edu.cn)

备注:国家自然科学基金;

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引用该论文

Yang Xiaohui,Wang Qi,Xiao Zewu,Wu Xiaoyan,Ren Jie,Wu Yanting. Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites[J]. Acta Optica Sinica, 2019, 39(10): 1016002

杨晓晖,王琦,肖择武,吴小龑,任杰,吴燕婷. 混合阳离子钙钛矿的高效率绿色发光器件[J]. 光学学报, 2019, 39(10): 1016002

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