Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Light-Emission Characteristics of Organic Light-Emitting Diodes Driven by Alternating Current

교류 전압 구동에 의한 유기 발광 소자의 발광 특성 연구

  • Kwon, Ow-Tae (Department of Information Display Engineering, Hongik University) ;
  • Kim, Tae-Wan (Department of Information Display Engineering, Hongik University)
  • 권오태 (홍익대학교 정보디스플레이공학과) ;
  • 김태완 (홍익대학교 정보디스플레이공학과)
  • Received : 2016.06.27
  • Accepted : 2016.09.22
  • Published : 2016.10.01
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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.

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References

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