Journal
ADVANCED MATERIALS
Volume 17, Issue 3, Pages 274-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.200400963
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Multilayer polymer light-emitting diodes are made using semiconducting polymers. An emissive polymer layer is cast from solution in an organic solvent, and a water-soluble (or methanol-soluble) conjugated copolymer is used for the electron transport layer (ETL) in the following device configuration: (indium tin oxide)/poly(3,4-ethylenedioxythiophene)/emissive polymer/ETL/Ba/Al. Devices with an ETL have significantly lower turn-on voltages, higher brightness values, and improved luminous efficiencies.
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