Efficient and bright warm-white electroluminescence from lead-free metal halides.
Efficient and bright warm-white electroluminescence from lead-free metal halides.
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无铅金属卤化物产生高效、明亮的暖白光电致发光
DOI:
10.1038/s41467-021-21638-x
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发表时间:
2021-03-03
影响因子:
16.6
通讯作者:
Wang J
中科院分区:
文献类型:
--
作者:
Chen H;Zhu L;Xue C;Liu P;Du X;Wen K;Zhang H;Xu L;Xiang C;Lin C;Qin M;Zhang J;Jiang T;Yi C;Cheng L;Zhang C;Yang P;Niu M;Xu W;Lai J;Cao Y;Chang J;Tian H;Jin Y;Lu X;Jiang L;Wang N;Huang W;Wang J
Solution-processed metal-halide perovskites are emerging as one of the most promising materials for displays, lighting and energy generation. Currently, the best-performing perovskite optoelectronic devices are based on lead halides and the lead toxicity severely restricts their practical applications. Moreover, efficient white electroluminescence from broadband-emission metal halides remains a challenge. Here we demonstrate efficient and bright lead-free LEDs based on cesium copper halides enabled by introducing an organic additive (Tween, polyethylene glycol sorbitan monooleate) into the precursor solutions. We find the additive can reduce the trap states, enhancing the photoluminescence quantum efficiency of the metal halide films, and increase the surface potential, facilitating the hole injection and transport in the LEDs. Consequently, we achieve warm-white LEDs reaching an external quantum efficiency of 3.1% and a luminance of 1570 cd m−2 at a low voltage of 5.4 V, showing great promise of lead-free metal halides for solution-processed white LED applications. Designing efficient light-emitting diodes with white-light-emission from broadband-emission metal halides remains a challenge. Here, the authors demonstrate bright and efficient lead-free LEDs based on cesium copper halides enabled by introducing Tween organic additive in the precursor.
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影响因子:
3.7
作者:
Kresse, G;Furthmuller, J
通讯作者:
Furthmuller, J
影响因子:
3.8
作者:
Rakita, Yevgeny;Kedem, Nir;Hodes, Gary
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影响因子:
29.4
作者:
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影响因子:
29.4
作者:
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通讯作者:
Hosono, Hideo
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4.7
作者:
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通讯作者:
Saparov, Bayrammurad