TITLE

Balanced ambipolar charge carrier mobility in mixed layers for application in hybrid white organic light-emitting diodes

AUTHOR(S)
Schwartz, Gregor; Tung-Huei Ke; Chung-Chih Wu; Walzer, Karsten; Leo, Karl
PUB. DATE
August 2008
SOURCE
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p073304
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
34135638

 

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