发光二极管
铅(地质)
光电子学
二极管
材料科学
红灯
生物
植物
古生物学
作者
Fanglong Yuan,Xiaopeng Zheng,Andrew Johnston,Ya‐Kun Wang,Chun Zhou,Yitong Dong,Bin Chen,Haijie Chen,James Z. Fan,Geetu Sharma,Peicheng Li,Yuan Gao,Oleksandr Voznyy,Hao‐Ting Kung,Zheng‐Hong Lu,Osman M. Bakr,Edward H. Sargent
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2020-10-14
卷期号:6 (42)
被引量:173
标识
DOI:10.1126/sciadv.abb0253
摘要
It remains a central challenge to the information display community to develop red light-emitting diodes (LEDs) that meet demanding color coordinate requirements for wide color gamut displays. Here, we report high-efficiency, lead-free (PEA)2SnI4 perovskite LEDs (PeLEDs) with color coordinates (0.708, 0.292) that fulfill the Rec. 2100 specification for red emitters. Using valeric acid (VA)-which we show to be strongly coordinated to Sn2+-we slow the crystallization rate of the perovskite, improving the film morphology. The incorporation of VA also protects tin from undesired oxidation during the film-forming process. The improved films and the reduced Sn4+ content enable PeLEDs with an external quantum efficiency of 5% and an operating half-life exceeding 15 hours at an initial brightness of 20 cd/m2 This work illustrates the potential of Cd- and Pb-free PeLEDs for display technology.
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