Abstract
The rate of annihilation delayed fluorescence of organic molecules localized on the surface of a layered spherical nanoparticle is calculated based on an original mathematical model on the assumption that one of the molecules remains stationary, while the other diffusively moves over the particle surface. A composite nanoparticle consists of a ferromagnetic (cobalt, nickel, or magnetite) core and a metal (Au or Ag) plasmon shell. Not only is the external uniform magnetic field into which the particle was placed taken into account, but also a nonuniform anisotropic magnetic field, formed by the ferromagnetic core of the composite, in the outer surface region of the particle. The predominant influence of the structural and geometric parameters of the system (the ratio of core radius to shell thickness) on the delayed fluorescence rate of molecules as a result of a plasmon increase/decrease in the radiative transition probability (more than 30%) is shown. The manifestation of the magnetic factor in the rate of the triplet–triplet annihilation reaction is less pronounced (about 10%). The obtained delayed fluorescence spectra of the layered ferroplasmonic nanocomposite with silver and gold shells demonstrate a clear dependence of the signal amplitude on the shell material and thickness.
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This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of research project no. FSGU-2020-0003.
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Translated by A. Sin’kov
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Kucherenko, M.G., Alimbekov, I.R. & Neyasov, P.P. Delayed Fluorescence of Molecules on the Surface of a Layered Ferroplasmonic Nanoparticle. Tech. Phys. 67, 632–643 (2022). https://doi.org/10.1134/S106378422209002X
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DOI: https://doi.org/10.1134/S106378422209002X