材料科学
量子效率
光电子学
发光二极管
钝化
钙钛矿(结构)
二极管
波长
纳米技术
化学工程
图层(电子)
工程类
作者
Lei Shu,Bing Han,Qianpeng Zhang,Swapnadeep Poddar,Daquan Zhang,Yu Fu,Yunzhen Cao,Yongcheng Ding,Yudong Zhu,Yuanjing Lin,Dai‐Bin Kuang,Jinfeng Liao,Zhiyong Fan
标识
DOI:10.1002/adfm.202306570
摘要
Abstract Metal halide perovskite materials have emerged as a promising class of semiconductors for high‐performance optoelectronic applications, particularly for light‐emitting diodes (LEDs), due to their high quantum efficiency, facile color tunability, narrow emission line widths, as well as cost‐effectiveness. Despite the great successes on green and red perovskite LEDs (PeLEDs), the external quantum efficiency (EQE) of blue PeLEDs still lags far behind that of green and red counterparts. Here, wavelength tunable pure and deep blue PeLEDs with high EQE are presented, achieving 17.5% and 10.8% for emission wavelengths of 472 and 461 nm, respectively. The wavelength tenability and high EQE are attributed to the unique vertically graded bandgaps and grain boundary organic shells in the perovskite films. The results demonstrate a significant performance improvement in blue PeLEDs, provide a novel route to fabricate high‐performance pure and deep blue PeLEDs that can match the performance of the green and red PeLEDs for future lighting and display applications.
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