Journal
ADVANCED MATERIALS
Volume 20, Issue 9, Pages 1624-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.200702229
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A cationic water-soluble polyfluorene containing ion-transporting side groups and mobile metal ions is synthesized. The material is used as an electron injection layer in polymer light-emitting diodes with high-work-function Al cathodes. The devices show high quantum efficiencies (see figure), with a maximum external quantum efficiency of 4.8%, approaching the theoretical maximum external quantum efficiency of about 5%.
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