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http://dx.doi.org/10.12925/jkocs.2002.19.1.10

Current-Voltage-Luminance Characteristics of Organic Light-Emitting Diodes with a Variation of PVK Concentration Used as a Buffer Layer  

Kim, Sang-Keol (Dept of Electrical Engineering, Kwangwoon University)
Hong, Jin-Woong (Dept of Electrical Engineering, Kwangwoon University)
Kim, Tae-Wan (Dept. of Physics, Hongik University)
Publication Information
Journal of the Korean Applied Science and Technology / v.19, no.1, 2002 , pp. 68-72 More about this Journal
Abstract
We have seen the effects of buffer layer in organic light-emitting diodes(OLEDs) using poly(N-vinylcarbazole)(PVK) depending on a concentration of PVK. Polymer PVK buffer layer was made using spin casting technique. Two device structures were fabricated; one is ITO/TPD/$Alq_{3}$/Al as a reference, and the other is ITO/PVK/TPD/$Alq_{3}$/Al to see the effects of buffer layer in organic light-emitting diodes. Current-voltage-luminance characteristics and an external quantum efficiency were measured with a variation of spin-casting rpm speeds and PVK concentration. We have obtained an improvement of external quantum efficiency by a factor of four when the PVK concentration is 0.1wt% is used. The improvement of efficiency is expected due to a function of hole-blocking of PVK in OLEDs.
Keywords
OLEDs; PVK; buffer layer; external quantum efficiency;
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