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 utility in optoelectronic devices. To overcome these limitations, we develop a postsynthesis passivation process for CsPbI 3 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.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of the American Chemical Society|
|State||Published - Jan 17 2018|
Bibliographical noteFunding Information:
The authors acknowledge funding support from KAUST. Z. Ning and Y. Shang acknowledge financial support from the Shanghai International Cooperation Project (16520720700), National Key Research and Development Program of China (under Grant No. 2016FYA0204000), and Shanghai key research program (16JC1402100).
© 2017 American Chemical Society.
ASJC Scopus subject areas
- Colloid and Surface Chemistry