Anomalous size-dependent decay of low-energy luminescence from PbS quantum dots in colloidal solution
ACS nano, 2012•ACS Publications
We report on an anomalous size dependence of the room-temperature photoluminescence
decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which
was found using the transient luminescence spectroscopy. The observed 10-fold reduction
in the decay time (from∼ 2.5 to 0.25 μs) with the increase in the quantum dots' diameter is
explained by the existence of phonon-induced transitions between the in-gap state whose
energy drastically depends on the diameter and the fundamental state of the quantum …
decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which
was found using the transient luminescence spectroscopy. The observed 10-fold reduction
in the decay time (from∼ 2.5 to 0.25 μs) with the increase in the quantum dots' diameter is
explained by the existence of phonon-induced transitions between the in-gap state whose
energy drastically depends on the diameter and the fundamental state of the quantum …
We report on an anomalous size dependence of the room-temperature photoluminescence decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which was found using the transient luminescence spectroscopy. The observed 10-fold reduction in the decay time (from ∼2.5 to 0.25 μs) with the increase in the quantum dots’ diameter is explained by the existence of phonon-induced transitions between the in-gap statewhose energy drastically depends on the diameterand the fundamental state of the quantum dots.
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