Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지
DOI QR코드

DOI QR Code

Electrical Conduction Mechanism in ITO/Alq3/Al Organic Light-emitting Diodes

  • Chung, Dong-Hoe (Department of Electrical Engineering, Kwangwoon University) ;
  • Lee, Joon-Ung (Department of Electrical Engineering, Kwangwoon University)
  • Published : 2004.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

We have used ITO/Alq$_3$/Al structure to study electrical conduction mechanism in organic light-emitting diodes. Current-voltage-luminance characteristics were measured at room temperature by varying the thickness of Alq$_3$ layer from 60 to 400mm. We were able to confirm that there are three different mechanisms depending on the applied voltage region; ohmic, space-charge-limited current, and trap-charge-limit-current mechanism. And the maximum luminous efficiency was obtained when the thickness of Alq$_3$ layer is 200nm.

Keywords

References

  1. P. S. Vincett, W. A. Barlow, R. A. Hann, and G. G. Roberts, 'Electrical conduction and low voltage blue electroluminescence in vacuum-deposited organic films', Thin Solid Films, Vol. 94, p. 171,1982 https://doi.org/10.1016/0040-6090(82)90509-0
  2. C. W. Tang and S. A. VanSlyke, 'Organic Electro luminescent Diodes', Appl. Phys. Lett., Vol. 51, p. 913,1987 https://doi.org/10.1063/1.98799
  3. Ma Dongge and I. A. Hummelgen, 'Charge carrier mobility in electroluminescent alternating block copolymers', J. Appl. Phys., Vol. 86, No.6, p. 3181, 1999 https://doi.org/10.1063/1.371237
  4. I. D. Parker, 'Carrier tunneling and device characteristics in polymer light-emitting diodes', J. Appl. Phys., Vol. 75, No.3, p. 1658, 1994
  5. J. W. Jeon, G. W. Kang, C. H. Lee, W. J. Song. and C. Seoul, 'Charge Carrier Tunneling in the Light-Emitting Diodes of Poly (p-phenylene) Thin Films', J. Kor. Phys. Soc., Vol. 36, No.6, p. 346, 2000
  6. Y. C. Kang, D. K. Chon, J. W. Song, Y. K. Kim, J. K. Kim, H. B. Gu, and H. S. Lee, 'A Study on the Green Emission Characteristics of $Alq_3$,', Proceedings of the KIEEME Annual Summer Conference 2002
  7. D. H. Chung, S. K. Kim, T. G. Chung, T. W. Kim, and J. U. Lee, 'Electrical Conduction Mechanism in OLEDs', Bulletin of KIEEME,Vol. 15, No.1, p. 7, 2002
  8. D. H. Chung, S. K. Kim, J. W. Hong, J. U. Lee, and T. W. Kim, 'Electrical properties and luminous efficiency in organic light-emitting diodes depending on buffer layer and cathodes', Journal of the KIEEME, Vol. 16, No.5, p. 409, 2003
  9. D. H. Chung, S. K. Kim, H. S. Oh, J. W. Hong, J. U. Lee, Y. S. Kim, and T. W. Kim, 'Effects of hole-injection buffer layer in organic light -emitting diodes', Journal of the KIEEME, Vol. 16, No.9, p. 816,2003

Cited by

  1. Mechanochemical treatment, specific features of the structure and properties, and reactivity of SHS systems based on natural materials. 1. Mechanochemical synthesis of disperse nanostructured composite quartz-based systems vol.86, pp.4, 2013, https://doi.org/10.1007/s10891-013-0903-2