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- W2116785496 abstract "Abstract The recombination dynamics and its temperature dependence are studied in detail in epitaxially grown CdSe/Zn(S,Se) quantum dots (QDs) with additional wide‐band MgS barriers. Such design allows to preserve a very high quantum yield and to track the QD recombination dynamics up to room temperature. At low temperatures, a fast initial decay ∼0.6 ns is observed which is followed by a long decay with a time constant ∼25 ns. The fast initial decay disappears with increasing temperature and above 100 K only a single‐exponential decay is observed with a decay time τ of 1.2–1.5 ns, which is weakly dependent on temperature up to 300 K. A two‐level model including bright and dark exciton states and temperature dependent spin‐flip between them describes well the experimental findings. According to the model, the long decay tail results from a thermally activated population of the bright exciton state from the energetically lowest dark state." @default.
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- W2116785496 date "2010-05-26" @default.
- W2116785496 modified "2023-10-09" @default.
- W2116785496 title "Radiative recombination dynamics of CdSe/Zn(S,Se)/MgS quantum dots up to room temperature" @default.
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- W2116785496 doi "https://doi.org/10.1002/pssb.200983250" @default.
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