Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 10: Plasmonics and Nanooptics: Light-Matter Interaction
HL 10.4: Vortrag
Montag, 7. März 2016, 11:30–11:45, S054
Photoluminescence Enhancement by laterally ordered Ag/Alq3:ZnPc/Ag Nanocavities — •Verena Kolb1 and Jens Pflaum1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Center of Applied Energy Research (ZAE Bayern), 97074 Würzburg
Plasmonic nanostructures provide a perfect possibility to tailor the photoluminescence (PL) of organic semiconductors. In this contribution we present PL investigations on silver nanoprism arrays prepared by shadow nanosphere lithography and resonantly coupled to the luminescence of ZnPc (zinc phthalocyanine) molecules. Confocal PL measurements revealed a strong increase of the fluorescence of ZnPc thin films deposited on top of the nanoprisms. Co-evaporation into an Alq3 (tris(8-hydroxyquinoline)aluminum) matrix at low concentrations of 4% leads to further increase, which can be explained by the reduction of non-radiative processes caused by exciton-exciton-annihilation and quenching at metal/organic interface. Lateral structuring of the organic layer and capping by silver result in periodically ordered Ag/Alq3:ZnPc/Ag hybrid structures with PL enhancement factors up to 700 after geometrical correction. Complementary FDTD simulations confirm the pronounced spectral overlap between the localized surface plasmon resonance and the highest PL mode and thus, are able to prove the enhancement to be of plasmonic origin.