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http://dx.doi.org/10.4313/JKEM.2014.27.2.104

Emission Characteristics of Fluorescent OLED with Alternating Current Power Source Driving Method  

Seo, Jung-Hyun (Department of Advanced Materials Science & Engineering, Daejin University)
Kim, Ji-Hyun (Department of Advanced Materials Science & Engineering, Daejin University)
Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.27, no.2, 2014 , pp. 104-109 More about this Journal
Abstract
To operate organic light emitting device (OLED) with alternating current (AC) power source without AC/DC(direct current) converter, we fabricated the fluorescent OLED and measured the emission characteristics with AC and DC. The OLED operated by AC showed higher maximum current efficiency of 8.2 cd/A and maximum power efficiency of 8.3 lm/W. But current efficiency and power efficiency of AC driven OLED showed worse than DC driven OLED at high voltage above 10 V. This result can be explained by the peak voltage of AC was $\sqrt{2}$ times than DC, In case of low driving voltage the emission characteristics were improved by the peak voltage of AC, but in case of high driving voltage the emission efficiencies were decreased by the roll off phenomena. Finally, serial OLED arrays using twelve OLEDs driven by AC 110 V showed average voltage of 9.17 V, voltage uniformity of 99.0%, average luminance of $1,175cd/m^2$, luminance uniformity of 94.4%.
Keywords
AC (alternating current); DC (direct current); OLED; Peak voltage;
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Times Cited By KSCI : 1  (Citation Analysis)
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