The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Current-Voltage Characteristics of Organic Light-Emitting Diodes with a Variation of Temperature

온도 변화에 따른 유기 전기 발광 소자의 전압-전류 특성

  • 김상걸 (광운대 공대 전기공학과) ;
  • 홍진웅 (광운대 공대 전기공학과·공대) ;
  • 김태완 (인하대 공대 기초과학과)
  • Published : 2002.07.01
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Abstract

Temperature-dependent current-voltage characteristics of organic light-emitting diodes(OLEDs) were studied in a device structure of ITO/TPD/Alq$_3$/Al to understand conduction mechanism. The current-voltage characteristics were measured in the temperature range of 8K ~ 300K. We analyzed an electrical conduction mechanism of the OLEDS using space-charge-limited current(SCLC) and Fowler-Nordheim tunneling. In the temperature range above 150k, the conduction mechanism could be explained by space charge limited current from the inversely proportional temperature dependence of exponent m. The characteristic trap energy is found to be about 0.15ev. At low temperatures below 150k, the Fowler-Nordheim tunneling conduction mechanism is dominant. We have obtained a zero field barrier height to be about 0.6~0.8eV.

Keywords

References

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