期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 19, 页码 6566-6569出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b02817
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-05-CH11231, KC3103]
We demonstrate postsynthetic modification of CsPbBr3 nanocrystals by a thiocyanate salt treatment. This treatment improves the quantum yield of both freshly synthesized (PLQY approximate to 90%) and aged nanocrystals (PLQY approximate to 70%) to within measurement error (2-3%) of unity, while simultaneously maintaining the shape, size, and colloidal stability. Additionally, the luminescence decay kinetics transform from multiexponential decays typical of nanocrystalline semiconductors with a distribution of trap sites, to a rnonoexponential decay, typical of single energy level emitters. Thiocyanate only needs to access a limited number of CsPbBr3 nanocrystal surface sites, likely representing under-coordinated lead atoms on the surface, in order to have this effect.
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