<title>Organic light-emitting diodes using spherical aggregates</title>
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ABSTRACTWe have succeeded in fabricating submicrometer-sized organic light emitting diodes (OLED) with bright emission using a polymer blend. The cell structure was composed of ITO (indium-tin oxide)fhole transport layer (polymer blend layer)/emitter layer/MgAg. We used poly (methyl methacrylate) (PMMA) as an inert host material and N,N'-diphenyl-N,N'-bis(3-methylphenyl)-[1, 1'-biphenyl]-4,4'-diamine-polycarbonate (PC-TPD) as a guest material. Thepolymer blend layers showed various morphology depending on the concentration of PC-TPD.With 2wt% of PC-TPD, the PC-TPD formed submicrometer-sized spherical domains, actually prolate spheroids, in the PMMA host layer. The domain diameters were around 200 nm according to AFM and SEM observations. The OLED including such a blend structure showed aggregation of bright submicrometer-sized electroluminescence spots. The number of working diodes exceeded four million per square centimeter.Keyword: Organic LED, electroluminescence, polymer blend, spherical aggregate, AFM,
収録刊行物
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- SPIE Proceedings
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SPIE Proceedings 3148 62-69, 1997-12-01
SPIE
