PEDT/PSS for efficient hole-injection in hybrid organic light-emitting diodes

Light-emitting diodes have been prepared by depositing three organic layers successively by spin-coat and evaporation techniques. The first layer of PEDT/PSS smoothens the ITO surface, reduces the probability of electrical shorts and is beneficial for a high overall yield of the operating devices. A...

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Bibliographic Details
Published inSynthetic metals Vol. 111; pp. 139 - 143
Main Authors Elschner, A, Bruder, F, Heuer, H.-W, Jonas, F, Karbach, A, Kirchmeyer, S, Thurm, S, Wehrmann, R
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.06.2000
Subjects
Electroluminescence
Organic LED
PEDT/PSS
Phenylamines
Poly(ethylendioxythiophen)
Starburst molecules
Organic LED
Electroluminescence
PEDT/PSS
Poly(ethylendioxythiophen)
Starburst molecules
Phenylamines
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Summary:Light-emitting diodes have been prepared by depositing three organic layers successively by spin-coat and evaporation techniques. The first layer of PEDT/PSS smoothens the ITO surface, reduces the probability of electrical shorts and is beneficial for a high overall yield of the operating devices. Above all, this layer promotes hole-injection as an important parameter for higher efficiencies and prolonged operation life. The second layer of spin-coated dendritic phenylamines (TDAPB) with high glass transition temperature modulates the injection of holes into the emitting layer, formed by evaporated Alq. By comparing characteristics and operation lifetime data of devices with and without PEDT/PSS it is shown that the combination of polymeric and monomeric organic layers leads to highly efficient devices, opening new ways to modify device architectures.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(99)00328-8