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Proceedings Article

Size-dependent room-temperature luminescence decay from PbS quantum dots

[+] Author Affiliations
Alexander P. Litvin, Peter S. Parfenov, Elena V. Ushakova, Anatoly V. Fedorov, Sergey A. Cherevkov, Alexander V. Baranov

National Research Univ. of Information Technologies, Mechanics and Optics (Russian Federation)

Mikhail V. Artemyev, Anatoly V. Prudnikau

Belarusian State Univ. (Belarus)

Ivan D. Rukhlenko

Monash Univ. (Australia)

Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85641Z (November 20, 2012); doi:10.1117/12.2001073
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From Conference Volume 8564

  • Nanophotonics and Micro/Nano Optics
  • Zhiping Zhou; Kazumi Wada
  • Beijing, China | November 05, 2012

abstract

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. © (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Alexander P. Litvin ; Peter S. Parfenov ; Elena V. Ushakova ; Anatoly V. Fedorov ; Mikhail V. Artemyev, et al.
" Size-dependent room-temperature luminescence decay from PbS quantum dots ", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85641Z (November 20, 2012); doi:10.1117/12.2001073; http://dx.doi.org/10.1117/12.2001073


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