Gregor SchwartzTung-Huei KeCHUNG-CHIH WUKarsten WalzerKarl Leo2018-09-102018-09-102008-01http://scholars.lib.ntu.edu.tw/handle/123456789/342720https://www.scopus.com/inward/record.uri?eid=2-s2.0-50249180153&doi=10.1063%2f1.2973151&partnerID=40&md5=21d012b008a7156010f699a542f996e2We 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. © 2008 American Institute of Physics.Alumina; Charge carriers; Civil aviation; Hole mobility; Light; Light emission; Light emitting diodes; Light metals; Organic light emitting diodes (OLED); Ambipolar; Charge transport layers; Charge-carrier mobilities; Charge-carrier transport; Driving currents; Electroluminescence spectrum; Experimental methods; External quantum efficiency; Interlayer thickness; Mixed layering; Single carriers; Space-charge limited currents; Time-of-flight measurements; White organic light-emitting diodes; Carrier mobilityjournal article10.1063/1.29731512-s2.0-50249180153WOS:000259010300076