20 November 2012 Size-dependent room-temperature luminescence decay from PbS quantum dots
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We study size dependence of kinetic and spectral properties of near-infrared luminescence from PbS quantum dots in colloidal solution. Luminescence lifetimes are found to lie between 250 ns for the largest quantum dots and 2:5 μs for the smallest ones, while the Stoke's shift is found to increase from 4-5 to 300 meV. These results are explained by the presence of the long-living in-gap state, with the size-dependent energy. Analytical modeling shows that the relaxation from this state is dominant in small quantum dots and negligible in large ones. Biexponential luminescence decay with the size-dependent recombination rates is predicted for quantum dots of all sizes.
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Alexander P. Litvin, Alexander P. Litvin, Peter S. Parfenov, Peter S. Parfenov, Elena V. Ushakova, Elena V. Ushakova, Anatoly V. Fedorov, Anatoly V. Fedorov, Mikhail V. Artemyev, Mikhail V. Artemyev, Anatoly V. Prudnikau, Anatoly V. Prudnikau, Sergey A. Cherevkov, Sergey A. Cherevkov, Ivan D. Rukhlenko, Ivan D. Rukhlenko, Alexander V. Baranov, Alexander V. Baranov, "Size-dependent room-temperature luminescence decay from PbS quantum dots", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85641Z (20 November 2012); doi: 10.1117/12.2001073; https://doi.org/10.1117/12.2001073

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