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http://dx.doi.org/10.4313/JKEM.2016.29.10.625

Light-Emission Characteristics of Organic Light-Emitting Diodes Driven by Alternating Current  

Kwon, Ow-Tae (Department of Information Display Engineering, Hongik University)
Kim, Tae-Wan (Department of Information Display Engineering, Hongik University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.29, no.10, 2016 , pp. 625-629 More about this Journal
Abstract
Electrical and optical properties of the AC voltage driven organic light-emitting diodes were investigated by measuring the electroluminescence of the device. Device structure of ITO(170 nm)/TPD(40 nm)/Alq3(60 nm)/LiF(0.5 nm)/Al(100 nm) was manufactured using a thermal evaporation. Sinusoidal and square-type AC voltage was applied to the device using a function generator. Amplitude of the applied voltage was 9.0 V, and a frequency was varied from 50 Hz to 50 kHz. Electroluminescence out of the device was measured in a Si photodetector simultaneously with the applied voltage together. An intensity and a delayed residual luminescence from the device were depended on the frequency of the sinusoidal voltage. It is thought to be due to a contribution of the capacitive nature in the equivalent circuit of the device. An electron mobility was estimated using a time constant obtained from the luminescence of the device driven by the square-type AC voltage.
Keywords
AC-OLED; Alternating current; Sinusoidal wave; Square wave; Charge recombination;
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Times Cited By KSCI : 2  (Citation Analysis)
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