Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3271773
Keywords
electroluminescent devices; excitons; fluorescence; gold; nanoparticles; organic light emitting diodes; surface plasmons
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A significant increase in electroluminescence was achieved through coupling with localized surface plasmons in a single layer of Au nanoparticles. We fabricated a thin-film organic electroluminescence diode, which consists of an indium tin oxide (ITO) anode, a Au nanoparticle array, a Cu phthalocyanine hole transport layer, a tris(8-hydroxylquinolianato) aluminum (III) electron transport layer, a LiF electron injection layer, and an Al cathode. The device structure, with size-controlled Au particles embedded on ITO, can be used to realize the optimum distance for exciton-plasmon interactions by simply adjusting the thickness of the hole transport layer. We observed a 20-fold increase in the molecular fluorescence compared with that of a conventional diode structure.
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