钙钛矿(结构)
卤化物
相(物质)
材料科学
蓝移
氢键
二极管
发光二极管
光电子学
结晶学
化学
无机化学
光致发光
分子
有机化学
作者
Qi Zhang,Longfei Yuan,Weigang Ding,Zhanpeng Qin,Shirong Wang,Hongli Liu,Xiaoming Zhao
出处
期刊:Small
[Wiley]
日期:2023-09-01
被引量:3
标识
DOI:10.1002/smll.202304821
摘要
Abstract Quasi‐2D (Q‐2D) perovskites with typical varied n‐phase structures deserve promising candidates in pursuing high‐performance perovskite light‐emitting diodes (PeLEDs). Whereas their weakness in precise n ‐phase distribution control disables the optical property of PeLEDs since the n = 1 phase is dominated by severe nonradiative recombination. Here, an effective phase distribution tailoring strategy is developed for pure blue PeLEDs by introducing taurine (TAU) into mixed halide Q‐2D perovskites. The sulfonic acid group in TAU can coordinate with Pb 2+ to suppress the formation of the n = 1 phase while promoting the growth of Q‐2D perovskites into domains with the graded distribution of n = 2 and 3. The amino group in TAU forms hydrogen bonds with electronegative halide ions, suppressing the formation of halide vacancies and reducing the defect density in the Q‐2D perovskite films. As a result, optimized blue Q‐2D perovskite films boosted PLQY to 92%. Target blue PeLED was endowed with a peak EQE of 14.82% (average 12.6%) at 475 nm and a maximum luminance of 1937 cd m −2 , which is among the reported high‐level pure blue PeLEDs. This work demonstrates a feasible approach to regulate the phase distribution of Q‐2D perovskites for high‐performance blue PeLEDs.
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