期刊
OPTICS EXPRESS
卷 20, 期 3, 页码 3144-3151出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.20.003144
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资金
- DARPA [HR0011-08-1-0063]
- AFOSR [FA9550-06-1-0413]
- Texas Higher Education Coordinating Board
We report measurements of the fluorescence decay times of CdSe/ZnS core-shell quantum dots at the air-dielectric interface for several dielectrics with different refractive indices. The results are in agreement with a simple theory that accounts for the impact of the refractive index on the density of states and magnitude of the vacuum field, as well as for the local-field correction inside the quantum dot. The results suggest that, by embedding the quantum dots into a high-index dielectric material, one can reduce the spontaneous decay time to sub-nanosecond scale while preserving high quantum efficiency. (C)2012 Optical Society of America
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