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Surface plasmon-assisted photoluminescence enhancement of Au-hybrid CdSe/ZnS nanocrystal quantum dots

ABSTRACT We demonstrated that radiative recombination rate of CdSe/ZnS nanocrystal quantum dots is enhanced by local surface plasmon of an adjacent Au layer as a consequence of the Purcell effect. In the presence of Au thin layer, the photoluminescence intensity and the decay rate of CdSe/ZnS nanocrystal quantum dots become significantly enhanced due to the coupling between the excitons of CdSe/ZnS nanocrystal quantum dots and the surface plasmon electric field of Au layer, whereby the Purcell factor (1.6 ∼ 2.3) has been obtained as a measure of enhancement.