Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Electrical and Optical Characteristics of Organic Light-Emitting Diodes for Various Thicknesses of the PTFE Layer

Lee, Young-Hwan;Kim, Weon-Jong;Kim, Tag-Yong;Hong, Jin-Woong;Kim, Tae-Wan

  • Published : 20070900
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Abstract

Organic light-emitting diodes (OLEDs) are attractive because of possible application in display with low-operating voltage, low-power consumption, self-emission, and a capability for multicolor emission by selection of emissive materials. In a device structure of ITO/polytetrafluorethylene (PTFE)/N,N'-diphenyl-N,N'-bis(3-methyphenyl)-1,1'-biphenyl-4,4'-diamine(TPD)/tris(8-hydroxyquinoline)aluminum(Alq$_3$)/Al, the effect of the PTFE layer was investigated, which is one of the important factors affecting the electrical characteristics of organic light-emitting diodes. We measured the current-voltage characteristics and the luminance of the device for various thicknesses of the PTFE layer in an ITO/PTFE/TPD/Alq$_3$/Al device structure. Compared with the device without PTFE, we found the optimal thickness of PTFE to be 2.0 nm from the device we studied. By using PTFE as a hole injection layer, we improved the luminance of the device by about 400 \%.

Keywords

References

  1. G. B. Blanchet, Y. L. Loo, J. A. Rogers, F. Gao and C. R. Fincher, Appl. Phys. Lett. 82, 463 (2003) https://doi.org/10.1063/1.1533110
  2. H. E. A. Huitema, G. H. Gelinck, J. B. P. H. Putten, K. E. Kuijk, K. M. Hart, E. Cantatore and D. M. Leeuw, Adv. Mater. 14, 1201 (2002)
  3. L. S. Hung and C. H. Chen, Mater. Sci. Engin. R. 39, 143 (2002)
  4. M. Pope, H. P. Kallmann and P. Magnante, J. Chem. Phys. 38, 2042 (1963)
  5. C. W. Tang and S. A. VanSlyke, Appl. Phys. Lett. 51, 913 (1987) https://doi.org/10.1063/1.98983
  6. J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackey, R .H. Friend, P. L. Burns and A. B. Holmes, Nature 347, 539 (1990)
  7. J. Y. Cho, H. S. Oh and S. B. Yoon, J. Korean Phys. Soc. 47, 484 (2005)
  8. C. Jiang W. Yang, J. Peng, S. Xiao and Y. Cao, Adv. Mater. 16, 537 (2004) https://doi.org/10.1002/adma.200306331
  9. Y. H. Lee, W. J. Kim, T. Y. Kim, J. H. Yang, K. S. Cho, J. W. Hong, J. Y. Shin and T. W. Kim, Mol. Crys. Liq. Crys. 462, 143 (2007) https://doi.org/10.1080/07370650601013088
  10. J. W. Choi, M. H. Kang, Y. S. Kim, J. H. Koo, J. H. Hur and J. Jang, J. Korean Phys. Soc. 49, S816 (2006)
  11. Y. H. Lee, W. J. Kim, T. Y. Kim, J. Jung, J. Y. Lee, H. D. Park, T. W. Kim and J. W. Hong, Curr. Appl. Phys. 7, 409 (2007) https://doi.org/10.1016/j.cap.2006.09.021
  12. Y. X. Zheng, J. H. Qiu, S. Y. Wang and L. Y. Chen, J. Korean Phys. Soc. 46, S260 (2005)
  13. J. Kido, M. Kohda, K. Okuyama and K. Nagai, Appl. Phys. Lett. 61, 761 (1992)
  14. W. J. Kim, Y. H. Lee, T. W. Kim and J. W. Hong, Tran. EEM. 6, 233 (2005)