Abstract
Emission of semiconductor quantum dots can be increased via two fundamentally differentprocesses: (i) surface plasmon resonances (plasmonic emission enhancement) and(ii) irradiation with light (photo-induced fluorescence enhancement). In this paper wetheoretically and experimentally study the mutual impacts of these processes on each otherin quantum dot solids. We show that when thin films of colloidal quantum dots are placedin the vicinity of Au nano-islands, the plasmonic enhancement of the radiative decay ratesof quantum dots and Forster energy transfer can hinder the photo-induced fluorescenceenhancement of these films. This in turn leads to significant suppression of theirplasmonic emission enhancement when they are irradiated with a laser beam. Weinvestigate the impact of the sizes and shapes of the metallic nanoparticles in thisprocess and theoretically analyze how plasmons and energy transfer can hinder theelectrostatic barrier responsible for photo-induced fluorescence enhancement.
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