期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 2, 页码 562-565出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10647
关键词
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资金
- Shanghai International Cooperation Project [16520720700]
- National Key Research and Development Program of China [2016FYA0204000]
- Shanghai key research program [16JC1402100]
- KAUST
Although halide perovskite :nanocrystals (NCs) are promising materials for optoelectronic devices, they suffer severely from chemical and phase instabilities. Moreover, the common capping'.ligands like oleic acid and oleylamine that encapsulate the NCs will form an insulating layer, precluding their futility in optoelectronic devices. To overcome these limitations, we develop a postsynthesis passivation process for CsPbI3 NCs by using a bidentate ligand, namely 2,2'-iminodibenzoic acid. Our passivated NCs exhibit narrow red photoluminescence with exceptional quantum yield (close to unity) and substantially improved stability. The passivated NCs enabled us to realize red light-emitting diodes (LEDs) with 5.02% external quantum efficiency and 748 cd/m(2) luminance, surpassing by far LEDs made from the nonpassivated NCs.
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