期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms15640
关键词
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资金
- National 1,000 Young Talents awards
- National Key Research and Development Program of China [2016YFB0700700]
- National Natural Science Foundation of China [61634001, 61574133]
- Beijing Municipal Science & Technology Commission [Z151100003515004]
- Young top-notch talent project of Beijing
- Netherlands Organisation for Scientific Research (NWO) [680-50-1511]
Inorganic perovskites such as CsPbX3 (X = Cl, Br, I) have attracted attention due to their excellent thermal stability and high photoluminescence quantum efficiency. However, the electroluminescence quantum efficiency of their light-emitting diodes was <1%. We posited that this low efficiency was a result of high leakage current caused by poor perovskite morphology, high non-radiative recombination at interfaces and perovskite grain boundaries, and also charge injection imbalance. Here, we incorporated a small amount of methylammonium organic cation into the CsPbBr3 lattice and by depositing a hydrophilic and insulating polyvinyl pyrrolidine polymer atop the ZnO electron-injection layer to overcome these issues. As a result, we obtained light-emitting diodes exhibiting a high brightness of 91,000 cd m(-2) and a high external quantum efficiency of 10.4% using a mixed-cation perovskite Cs(0.87)MA(0.13)PbBr(3) as the emitting layer. To the best of our knowledge, this is the brightest and most-efficient green perovskite light-emitting diodes reported to date.
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