Abstract
Energy transfer process and coupling-strength between PbS (PbSe) quantum dots have been studied by means of photoluminescence (PL), micro-PL, and spatially-resolved PL measurements. The energy-dependent transfer rate of excitons from smaller to larger dots via electronic coupling is observed. It has been shown that an efficient energy transfer occurs between quantum dots having a significant band gap energy difference, i.e., between dots of markedly different size. Thus, a promising way to enhance energy transfer between different subsets of quantum dots is to red-shift the emission sufficiently far from the host absorption so that self-absorption by the host becomes negligible. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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