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Balanced ambipolar charge carrier mobility in mixed layers for application in hybrid white organic light-emitting diodes
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/content/aip/journal/apl/93/7/10.1063/1.2973151
2008-08-20
2014-12-22

Abstract

We investigate the electron and hole mobility in mixed layers of -di(naphthalen-1-yl)--diphenyl-benzidine and bis(2-methyl-8-quinolinato)-4-phenylphenolate aluminum with different mix ratios, using both space-charge limited currents of single-carrier devices with electrically dopedcharge transport layers and time-of-flight measurements. Both experimental methods yield consistent results. The 1:1 blend shows balanced ambipolar charge carrier transport, which is advantageous for the application as exciton blocking interlayer in hybrid white organic light-emitting diodes: The electroluminescence spectrum is rather stable against changes in interlayer thickness and driving current. Moreover, the external quantum efficiency is enhanced by a factor of 2.5 as compared to a device without interlayer.

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Scitation: Balanced ambipolar charge carrier mobility in mixed layers for application in hybrid white organic light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/7/10.1063/1.2973151
10.1063/1.2973151
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