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- W2170291215 abstract "We report on the temperature dependence of the band-edge photoluminescence decay of organically capped colloidal ZnSe quantum dots (QDs) in the size range from 4.0 to 7.5 nm. A similar trend is observed for all investigated sizes: the decay time is short (∼5 ns) above 20 K and increases sharply below 20 K, eventually reaching a constant value (270–400 ns) at sufficiently low temperatures (<4 K). The temperature regime in which the decrease of lifetime occurs depends on the QD size and is lower for larger QDs. This behavior can be modeled by a Boltzmann distribution between a lower long-lived and a higher short-lived exciton states, with an energy separation ranging from 3.3 ± 0.2 to 1.5 ± 0.1 meV in the 4.0 ± 0.3 to 7.5 ± 0.5 nm size range. We show that this energy separation is consistent with coupling of the lowest exciton state to a confined acoustic phonon." @default.
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- W2170291215 date "2014-09-30" @default.
- W2170291215 modified "2023-09-25" @default.
- W2170291215 title "Unravelling the Size and Temperature Dependence of Exciton Lifetimes in Colloidal ZnSe Quantum Dots" @default.
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- W2170291215 doi "https://doi.org/10.1021/jp5038238" @default.
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