卤化物
光致发光
光电子学
纳米晶
氯
二极管
发光二极管
材料科学
钙钛矿(结构)
量子效率
无机化学
化学
纳米技术
结晶学
冶金
作者
Yun Gao,Qiuting Cai,Yifan He,Dingshuo Zhang,Qingli Cao,Meiyi Zhu,Zichao Ma,Baodan Zhao,Haiping He,Dawei Di,Zhizhen Ye,Xingliang Dai
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2024-07-17
卷期号:10 (29)
被引量:2
标识
DOI:10.1126/sciadv.ado5645
摘要
Perovskite light-emitting diodes (PeLEDs) provide excellent opportunities for low-cost, color-saturated, and large-area displays. However, the performance of blue PeLEDs lags far behind that of their green and red counterparts. Here, we show that the external quantum efficiencies (EQEs) of blue PeLEDs scale linearly with the photoluminescence quantum yields (PL QYs) of CsPb(Br x Cl 1− x ) 3 nanocrystals emitting at 460 to 480 nm. The recombination efficiency of carriers is highly sensitive to the chlorine content and the related deep-level defects in nanocrystals, causing notable EQE drops even with minor increases in chlorine defects. Minor adjustments of chlorine content through rubidium compensation on the A-site effectively suppress the formation of nonradiative defects, improving PL QYs while retaining desirable bandgaps for blue-emitting nanocrystals. Our PeLEDs with record-high efficiencies span the blue spectrum, achieving peak EQEs of 12.0% (460 nm), 16.7% (465 nm), 21.3% (470 nm), 24.3% (475 nm), and 26.4% (480 nm). This work exemplifies chlorine-defect control as a key design principle for high-efficiency blue PeLEDs.
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