Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2973151
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Funding
- European Commission [IST-2002-004607]
- Deutscher Akademischer Austausch Dienst (DAAD)
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We investigate the electron and hole mobility in mixed layers of N, N '-di(naphthalen-1-yl)-N, N '-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 doped charge 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. (c) 2008 American Institute of Physics.
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