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

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

DOI QR Code

Improved Efficiency and Lifetime for Organic Light-emitting Devices based on Mixed-hole Transporting Layer

혼합된 정공 수송 층을 이용한 유기발광소자의 효율 및 수명 개선

  • 서지현 (홍익대학교 정보디스플레이학과) ;
  • 박정현 (홍익대학교 정보디스플레이학과) ;
  • 박일흥 (홍익대학교 정보디스플레이학과) ;
  • 김준호 (홍익대학교 전자공학과) ;
  • 김영관 (홍익대학교 정보디스플레이학과)
  • Published : 2007.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

Organic light-emitting diodes (OLEDs) with the high efficieney and long lifetime are of growing interest in next-generation displays. Among the factors influencing OLEDs properties, one of unstable factor is $Alq_3$ cationic species caused by the excess holes resided in $Alq_3$ layer. Therefore, we suppressed the accumulation of excess holes by using the mixed-hole transporting layer (MHTL) of NPB and CBP in multilayer green OLEDs. The devices with MHTL showed improved characteristics in the luminous efficiency and lifetime. More characteristics and the carrier transport mechanism will be discussed.

Keywords

References

  1. X. J. Wang, J. M. Zhao, Y. C. Zhou, X. Z. Wang, S. T. Zhang, Y. Q. Zhan, Z. Xu, H. J. King, G. Y. Zhong, H. Z. Shi, Z. H. Ciong, Y. Liu, Z. J. Wang, E. G. Obbard, and X. M. King, 'Enhancement of electron injection in organic light-emitting devices using an Ag/LiF cathode', J. of Appl. Phys., Vol. 95, p. 3828, 2004 https://doi.org/10.1063/1.1655676
  2. H. Aziz and Z. D. Popovic, 'Degradation phenomena m small-molecuale organic light-emitting devices', Chem. Mater., Vol. 16, p. 4522, 2004 https://doi.org/10.1021/cm040081o
  3. 정동희, 김상걸, 홍진웅, 이준응, 김태완, '버퍼층과 음전극에 따른 유기 발광 소자의 전기적 특성과 발광 효율', 전기전자재료학회논문지, 16권, 5호, p. 409, 2003
  4. C. W. Tang and S. A. VanSlyke, 'Organic electroluminescence diode', Appl. Phys. Lett., Vol. 51, p. 913, 1987 https://doi.org/10.1063/1.98799
  5. H. H. Fong, K. C. Lun, and S. K. So, 'Extrinsic electron traps in tris(8-hydroxyquinoline) aluminium', Jpn. J. Appl. Phys. Part 2, Vol. 41, p. L1122, 2002 https://doi.org/10.1143/JJAP.41.L1122
  6. S. C. Tse, H. H. Fong, and S. K. So, 'Electron transit time and reliable mobility measurements from thick film hydroxyquinoline-based organic light-emitting diode', J. Appl. Phys., Vol. 94, p. 2033, 2003 https://doi.org/10.1063/1.1589175
  7. H. Aziz, Z. D. Popovic, N. X. Hu, A. M. Hor, and G. Xu, 'Degradaton mechanism of small molecule-based organic light-emitting devices', Science, Vol. 283, p. 1900, 1999 https://doi.org/10.1126/science.283.5409.1900
  8. Z. D. Popovic, H. Aziz, N. X. Hu, A. Ioannidis, and P. N. M. dos Anjos, 'Simultaneous electroluminescence and photoluminescence again studies of tris(8-hydroxyquinoline) aluminum-based organic light-emitting devices', J. Appl. Phys., Vol. 89, p. 4673, 2001 https://doi.org/10.1063/1.1354631
  9. H. Aziz, Z. D. Popovic, C. P. Tripp, N. Hu, A. Hor, and G. Xu, 'Degradation processes at the cathode/organic interface in organic light emitting devices with Mg:Ag cathodes', Appl. Phvs. Lett., Vol. 72, p. 2642, 1998 https://doi.org/10.1063/1.121442
  10. S. F. Lim, L. Ke, W. Wang, and S. J. Chua, 'Correlation between dark spot growth and pinhole size in organic light-emitting diodes', Appl. Phys. Lett., Vol. 78, p. 2116, 2001 https://doi.org/10.1063/1.1364658
  11. T. P. Nguyen, L. P. Rendu, and N. N. Dinh, 'Thermal and chemical treatment of ITO substrates for improvement of OLED performance', Synth. Met., Vol. 138, p. 229, 2003 https://doi.org/10.1016/S0379-6779(02)01292-4

Cited by

  1. A Study on Electrical Characteristics of Trench Field Ring for Breakdown Characteristics vol.23, pp.1, 2010, https://doi.org/10.4313/JKEM.2010.23.1.001
  2. Study on the ITO Pre-treatment for the Highly Efficient Solution Processed Organic Light-emitting Diodes vol.23, pp.1, 2010, https://doi.org/10.4313/JKEM.2010.23.1.018