INVESTIGATION OF LUMINESCENCE KINETICS IN PbS QUANTUM DOTS
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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.