Acta Optica Sinica, Volume. 39, Issue 10, 1016002(2019)
Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites
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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Xiaohui Yang, Qi Wang, Zewu Xiao, Xiaoyan Wu, Jie Ren, Yanting Wu. Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites[J]. Acta Optica Sinica, 2019, 39(10): 1016002
Category: Materials
Received: Apr. 28, 2019
Accepted: Jun. 25, 2019
Published Online: Oct. 9, 2019
The Author Email: Yang Xiaohui (xhyang@swu.edu.cn)