INVESTIGATION OF LUMINESCENCE KINETICS IN PbS QUANTUM DOTS

Litvin Alexander Petrovich, Parfenov Peter Sergeevich, Ushakova Elena Vladimirovna, Baranov Alexander Vasilievich

2012 , VOLUME 12, NUMBER 5 ( September-October )

ISSN 2226-1494 (print), ISSN 2500-0373 (online)

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Nikiforov
Vladimir O.
D.Sc., Prof.

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INVESTIGATION OF LUMINESCENCE KINETICS IN PbS QUANTUM DOTS

A. P. Litvin, P. S. Parfenov, E. V. Ushakova, A. V. Baranov

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Abstract

The dimensional dependence of the spectral and kinetic parameters of the PbS quantum dots luminescence has been investigated in a wide spectral range (0.8 - 2 microns). Registered lifetimes lie in the range of 0.25 - 2.7 ms, and decrease with the nanocrystal sizes growth. We consider a three-level model with the energy level in the forbidden zone to explain such long luminescence lifetimes. It is shown that the anomalous size dependence of the luminescence lifetimes can be related to the existence of transitions with both decreasing and increasing of energy at room temperature.

Keywords: quantum dots, luminescence, near-infrared region, luminescence lifetimes

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