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Silver nanoparticles (Ag NPs) thin film were fabricated by radio-frequency (RF) magnetron sputtering on the quartz substrates in different sputtering time, then covered with a layer of rubrene by means of thermal evaporation. The sputtering time for preparation of Ag NPs could be tuned to increase the spectral overlap between the emission spectra of rubrene and surface plasmon resonance spectra, so that the surface plasmon enhancement was improved. Using a Fluorescence spectrophotometer (FLS920), the photoluminescence (PL) intensity of the rubrene/Ag NPs thin film was up to 22 times higher than that as-deposited rubrene thin film. It is attributed to the energy transfer effect in the surface plasmon resonance coupling, the surface plasmons mediated emission, and light scattering. © (2015) Trans Tech Publications, Switzerland.
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