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RESONANT AND NON-RESONANT INTERACTION OF SEMICONDUCTOR NANOCRYSTALS WITH LOCALIZED PLASMONS

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Subject of Research. The paper presents the study of fluorescence enhancement of semiconductor nanocrystals and organic dyes using plasmon resonances. The study is interesting from both basic and applied science point of view. Among recent articles devoted to this topic, the one by Egorushina, et al. was high-profile, and described the case of fluorescence enhancement during nonresonant interaction of molecules and metallic nanoparticles, which is an unusual and poorly studied phenomenon. We made an attempt to perform a similar experimental study for quantum dots. Method. Samples of metallic nanoparticles with plasmon resonances in the visible spectrum region were fabricated using deposition of silver vapor in a high-vacuum chamber. The equivalent layer thickness was 5 nm, the lateral size of the islands was 30–50 nm. CdSe/ZnS semiconductor nanocrystals with a luminescence maximum at a wavelength of 630 nm and CdSe/ZnS nanocrystals with a gradient composition of the ZnS shell and a luminescence maximum at a wavelength of 520 nm were synthesized through the “hot injection” protocol. Solutions of quantum dots were deposited on island films by a spin-coating method. The absorption of the samples was measured on SF-56 spectrophotometer. Fluorescence was measured using RF-5301PC spectrofluorimeter. The luminescence decay kinetics of the samples was also studied. Main Results. As a result, luminescence enhancement during resonant interaction of quantum dots and quenching of luminescence during nonresonant interaction were obtained. The luminescence lifetime decrease characteristic of the Purcell effect was observed in both cases. Practical Relevance. Metal nanoparticles as the resonator will increase the fluorescence quantum yield of various quantum emitters by the Purcell effect.

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