期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 39, 页码 16175-16177出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja307996b
关键词
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资金
- U.S. National Science Foundation [DMR-1206221]
- Research Corporation
- University of Washington
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206221] Funding Source: National Science Foundation
Chemical reductants of sub-conduction-band potentials are demonstrated to induce large photoluminescence enhancement in colloidal ZnSe-based nanocrystals. The photoluminescence quantum yield of colloidal Mn2+-doped ZnSe nanocrystals has been improved from 14% to 80% simply by addition of an outer-sphere reductant. Up to 48-fold redox brightening is observed for nanocrystals with lower starting quantum yields. These increases are quickly reversed upon exposure to air and are temporary even under anaerobic conditions. This redox brightening process offers a new and systematic approach to understanding redox-active surface trap states and their contributions to the physical properties of colloidal semiconductor nanocrystals.
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