Abstract
Herein we report a symmetric study of metal surface plasmon-enhanced emission of conjugated polymer (poly[2,5-bis(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene], BDMO-PPV) in the process that silver metal substrates changed from isolated nano-particles to continuous metal film. It was found that photoluminescence (PL) enhancement was mainly raised from coupling of BDMO-PPV excitons with localized surface plasmon (LSP) of Ag nano-particles when the thickness of deposited Ag film was smaller than 15nm. However, surface plasmon polaritons (SPPs) dominated the PL enhancement when the thickness of deposited Ag film reached 20nm or thicker. Temperature dependent PL of BDMO-PPV on the silver substrates were also investigated in the range of 10–300K. Bose–Einstein statistical factors were calculated to reveal the mechanistic aspects of the observed temperature dependent fluorescence enhancement on Ag nano-films with variable thickness.
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