TY - JOUR
T1 - Efficient and bright warm-white electroluminescence from lead-free metal halides
AU - Chen, Hong
AU - Zhu, Lin
AU - Xue, Chen
AU - Liu, Pinlei
AU - Du, Xuerong
AU - Wen, Kaichuan
AU - Zhang, Hao
AU - Xu, Lei
AU - Xiang, Chensheng
AU - Lin, Chen
AU - Qin, Minchao
AU - Zhang, Jing
AU - Jiang, Tao
AU - Yi, Chang
AU - Cheng, Lu
AU - Zhang, Chenglong
AU - Yang, Pinghui
AU - Niu, Meiling
AU - Xu, Wenjie
AU - Lai, Jingya
AU - Cao, Yu
AU - Chang, Jin
AU - Tian, He
AU - Jin, Yizheng
AU - Lu, Xinhui
AU - Jiang, Lang
AU - Wang, Nana
AU - Huang, Wei
AU - Wang, Jianpu
N1 - Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85102017465&partnerID=8YFLogxK
U2 - 10.1038/s41467-021-21638-x
DO - 10.1038/s41467-021-21638-x
M3 - 文章
C2 - 33658523
AN - SCOPUS:85102017465
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1421
ER -