We demonstrated that the plasmonic effect can enhance the photoluminescence of the europium organometallic complex in conventional organic light emitting diodes stack from an anode to emissive layer with solution processing. The aggregated gold nanoparticles (A-Au NPs) were incorporated in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) layer to increase the luminescent quantum efficiency of the emissive layer. An enhancement of 31% was achieved in the emission intensity at 614 nm for samples with A-Au NPs. The reduced exciton lifetime measured by time-resolved photoluminescence comply with the Purcell effect. These improvements are attributed to the localized surface plasmon of A-Au NPs increasing the electric dipole transition rate from Eu 3+ ions.Index Terms-Europium, photoluminescence, plasmons, rare earth metals.
We report a localized surface plasmonic enhanced phosphor using Au nanoparticles. The method is simple and widely used for various phosphor materials. When the localized surface plasmon resonance of Au nanoparticles matches the emission wavelength of the phosphor materials, the efficiency of the phosphor is enhanced. The phosphor luminance intensity is enhanced with the application of an optimum concentration of Au nanoparticles. In order to check the wavelength-dependent effect of localized surface plasmon resonance, we experimented with different phosphor materials, having emission wavelength peaks at 520 nm, 560 nm, and 620 nm. We found the differences in plasmonic enhancement by the wavelength dependency.
We elucidated the distance-dependent plasmonic effects on radiative transitions from an Eu(3+) ion-doped phosphor by varying the thickness of the dielectric spacer. Magnesium oxide prepared by electron-beam evaporation was chosen for the dielectric spacer. Spectral overlap between emission from Eu(3+) ions and the plasmon band of Ag nanoparticles led to improved luminescence intensity. This luminous enhancement was effective within the area of influence by localized surface plasmon resonance. At a long distance, the plasmon-enhanced luminescence was not effective. In addition, the numerical analysis results were in good agreement with the distance-dependent decay characteristics of plasmon resonance.
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