Preparation and optoelectronic properties of multi-color high-efficiency CH3NH3Pb(BrxI1-x)3 perovskite light-emitting diodes

被引：1
作者：
Cai, Xiangcheng [1 ]
Tu, Peng [1 ]
Ai, Yansong [2 ]
He, Hongshen [2 ]
Shen, Peng [2 ]
Zhou, Yuanming [2 ]
Mei, Fei [2 ]
机构：
[1] Hubei Univ Technol, Sch Elect & Elect Engn, Wuhan 430068, Peoples R China
[2] Hubei Univ Technol, Sch Sci, Wuhan 430068, Peoples R China
来源：
MATERIALS RESEARCH EXPRESS | 2023年 / 10卷 / 07期
基金：
中国国家自然科学基金;
关键词：
perovskite light-emitting diodes; multi-color; PEABr; mixed halide system; HIGH-PERFORMANCE; NANOCRYSTALS; EMISSION; DEVICES; LAYERS;
D O I：
10.1088/2053-1591/ace0fe
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Multi-color light-emitting materials are essential lighting and displays. In this study, mixed halide system was applied to precisely tune the bandgap of CH3NH3Pb(Br (x) I1-x )(3), thus regulating the emission wavelength. PEABr was employed to change the phase structure and morphology of CH3NH3Pb(Br (x) I1-x )(3) perovskite thin films and improve the performance of multi-color perovskite light-emitting diodes (PeLEDs). Theoretical simulations through first-principles calculations and experiments demonstrate that multi-color PeLEDs can be achieved by adjusting the ratio of bromine (Br) and iodine (I) atoms in the CH3NH3Pb(Br (x) I1-x )(3) perovskite. The maximum luminance of PEABr-modified green PeLEDs reached 7108 cd m(-2), with a maximum current efficiency of 8.25 cd A(-1) and a maximum external quantum efficiency (EQE) of 1.62%, which were greatly improved compared to the reference device without PEABr. In addition, the luminance of orange-yellow and red mixed-halide PeLEDs both exceed 100 cd m(-2). The results demonstrate that the use of PEABr additive can effectively control the morphology of CH3NH3Pb(Br (x) I1-x )(3) crystals, and high-performance multi-color light-emitting devices can be achieved by combining with mixed halide system. The electroluminescence spectra showed that the emission range of the devices covered the wavelength region of 520-720 nm, demonstrating their good application prospects in the field of multi-color displays.
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页数：11
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