Surface Plasmon Enhanced Photoluminescence from Copper Nanoparticles: Influence of Temperature

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

Anomalous temperature dependence of surface plasmon enhanced photoluminescence from copper nanoparticles embedded in a silica host matrix has been observed. The quantum yield of photoluminescence increases as the temperature increases. The key role of such an effect is the interplay between the surface plasmon resonance and the interband transitions in the copper nanoparticles occurring at change of the temperature. Namely, the increase of temperature leads to the red shift of the resonance. The shift leads to increase of the spectral overlap of the resonance with photoluminescence band of copper as well as to the decrease of plasmon damping caused by interband transitions. Such mechanisms lead to the increase of surface plasmon enhancement factor and, consequently, to increase of the quantum yield of the photoluminescence.

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