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Highly efficient light emitting diodes were obtained by blending blue-emitting poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(N,N′-diphenyl)-N,N-di(p-butyl-oxyphenyl)-1,4-diaminobenzene] (I) with green-emitting poly[(9,9-dioctyl-2,7-divinylene-fluorenylene)-alt-co-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}] (II). Only green emission was obtained from the films of polymer blends and from corresponding...
Light emitting properties of several polyfluorene (PF) copolymers (P1–P4) and their blends have been investigated. Light emitting diodes were fabricated with the configuration of ITO/PEDOT:PSS/polymer/Ca/Al. The EL peak wavelengths were 421nm (violet), 505, 513nm (green) and 570nm (yellow) for PF copolymers and 510, 535nm (green) for P1/P2 and P1/P3 blends, respectively. Förster energy transfer in...
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