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A novel and simple Sm(3+)-doped-polymer/Ag/ SiO(2) trilayer structure was fabricated to investigate the impact of surface plasmon polaritons (SPPs) on the emission quantum efficiency of the dipole emitter Sm(3+). Photoluminescence (PL) enhancement factors for samples with different Ag thicknesses (30-70 nm) were found to be different when the thickness of the Sm(3+)-doped-polymer film was kept constant (220 nm). Theoretical analysis suggests that the electron density of the metal film plays an important role in the SPP assisted PL enhancement process, and this was confirmed in a Sm(3+)-doped-polymer/Ag/Au/ SiO(2) multilayer structure.
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Lin et al. (2009) studied this question.
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