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

作　　者：杨晓晖[1] 王琦 肖择武 吴小龑 任杰 吴燕婷 Yang Xiaohui;Wang Qi;Xiao Zewu;Wu Xiaoyan;Ren Jie;Wu Yanting(School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang,Sichuan621900,China)

机构地区：[1]西南大学物理科学与技术学院,重庆400715 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《光学学报》2019年第10期244-250,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11474232)

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。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.

关 键 词：材料 钙钛矿发光器件 乙基胺阳离子 缺陷钝化 

分 类 号：O469[理学—凝聚态物理]