2 May 2014 Förster resonant energy transfer in lead sulfide QD assemblies
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Concentration-dependent optical properties of lead sulfide (PbS) quantum dots (QDs) embedded into a porous matrix are investigated. A red shift of luminescence peak position depends on QD concentration and evidences for F¨orster resonant energy transfer (FRET) inside the quasi-monodispersed assemblies. PL decay curves show significant influence of FRET process on QD optical properties. PL lifetime size-dependencies are found to be dependent on the QD concentration. The growing impact of FRET process with increasing QD concentration leads to transformation of anomalous size-dependence of PL lifetimes to the inverse. FRET efficiency gradually increases with QD concentration and saturates at 35% that corresponds to the formation of an ordered QD superstructure. Formation of PbS QD superstructure is confirmed by X-ray analysis, while calculated interdot distance in the superstructure coincides with the one obtained by FRET technique.
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Aleksandr P. Litvin, Aleksandr P. Litvin, Elena V. Ushakova, Elena V. Ushakova, Peter S. Parfenov, Peter S. Parfenov, Sergey A. Cherevkov, Sergey A. Cherevkov, Anatoly V. Fedorov, Anatoly V. Fedorov, Alexander V. Baranov, Alexander V. Baranov, "Förster resonant energy transfer in lead sulfide QD assemblies", Proc. SPIE 9126, Nanophotonics V, 912626 (2 May 2014); doi: 10.1117/12.2051649; https://doi.org/10.1117/12.2051649

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