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Balanced ambipolar charge carrier mobility in mixed layers for application in hybrid white organic light-emitting diodes
2.A. Hunze, R. Krause, S. Seidel, O. Weiss, F. Kozlowski, G. Schmid, J. Meyer, M. Kroeger, H. H. Johannes, W. Kowalsky, and T. Dobbertin, Proc. SPIE 6555, 66550X–1 (2007).
5.P. C. Chen, W. Xie, J. Li, T. Guan, Y. Duan, Y. Zhao, S. Liu, C. Ma, L. Zhang, and B. Li, Appl. Phys. Lett. 91, 023505 (2007).
11.W. -Y. Hung, T. -H. Ke, Y. -T. Lin, C. -C. Wu, T. -H. Hung, T. -C. Chao, K. -T. Wong, and C. -I. Wu, Appl. Phys. Lett. 88, 064102 (2006).
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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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