Temperature Dependent Surface Plasmon Enhanced Photoluminescence from Silver Nanopartocles

Illya Bondarchuk Department of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine Yeshchenko Oleg Department of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine Losytskyy Mykhaylo Department of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine Alexeenko Alexandr Laboratory of Technical Ceramics and Silicates, Gomel State Technical University, Gomel, Belarus

The strong temperature dependence of the photoluminescence spectra from silver nanoparticles embedded in a silica host matrix has been observed. The photoluminescence from Ag nanoparticle is enhanced by coupling of exciting and emitted photons to surface plasmon resonance excited in nanoparticle. The quantum yield of the photoluminescence increases when the temperature decreases. Such effect has been rationalized as the result of increase of the plasmonic enhancement factor with decreasing temperature occurring due to decrease of surface plasmon damping constant. The decrease of damping constant is due to the decrease of electron-phonon scattering rate with decreasing temperature. The temperature dependence of quantum yield of the photoluminescence is stronger for small nanoparticles reflecting the fact of strengthening of electron-phonon coupling in the silver nanoparticles with decrease of their size.

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