Transactions on Electrical and Electronic Materials

  • 제8권5호
  • /
  • Pages.218-221
  • /
  • 2007
  • /
  • 1229-7607(pISSN)
  • /
  • 2092-7592(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
권호 표지
DOI QR코드

DOI QR Code

White Organic Light Emitting Diodes using Red and Blue Phosphorescent Materials with Blocking Layer

  • Park, Jung-Hyun (Department of Information Display, Hong Ik University) ;
  • Kim, Gu-Young (Department of Information Display, Hong Ik University) ;
  • Lee, Seok-Jae (Department of Information Display, Hong Ik University) ;
  • Seo, Ji-Hyun (Department of Information Display, Hong Ik University) ;
  • Seo, Ji-Hoon (Department of Information Display, Hong Ik University) ;
  • Kim, Young-Kwan (Department of Information Display, Hong Ik University)
  • 발행 : 2007.10.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

High-efficiency white organic light-emitting diodes(WOLEDs) were fabricated with two emissive layers and an blocking layer was sandwiched between two phosphorescent dopants, bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III(FIrpic) as the blue emission and a newly synthesized red phosphorescent material guest, bis(5-acetyl-2-phenylpyridinato-N,C2') acetylacetonate($(acppy)_2Ir(acac)$). This blocking layer prevented a T-T annihilation in a red emissive layer, and balanced with blue and red emission as blocking of hole carriers. The white device showed Commission Internationale d'Eclairage($CIE_{x,y}$) coordinates of (0.317, 0.425) at 22400 $cd/m^2$, a maximum luminance of 27300 $cd/m^2$ at 268 $mA/cm^2$, a maximum luminous efficiency and power efficiency of 26.9 cd/A and 18.6 lm/W.

키워드

참고문헌

  1. J. Kido, M. Kimura, and K. Nagai, 'Multilayer white light-emitting organic electroluminescent device', Science, Vol. 267, p. 1332, 1995
  2. Y. Sun, N. C. Giebink, H. Kanno, B. Ma, M. E. Thompson, and S. R. Forrest, 'Management of singlet and triplet excitons for efficient white organic light-emitting devices', Nature, Vol. 440, p. 908, 2006 https://doi.org/10.1038/nature04645
  3. C. J. Lee, R. B. Pode, D. G. Moon, and J. I. Han, 'Red electrophosphorescent top emission organic light-emitting device with Ca Ag semitransparent cathode', Appl. Phys. Lett., Vol. 89, p. 253508, 2006 https://doi.org/10.1063/1.2420770
  4. H. K. Lee, J. H. Seo, J. H. Kim, J. R. Koo, K. H. Lee, S. S. Yoon, and Y. K. Kim, 'Investigation of blue organic light-emitting diodes (OLEDs) with various hosts', J. Kor. Phys. Soc., Vol. 49, p. 1052, 2006
  5. S. Y. Kim, H. Y. Shim, J. H. Seo, and Y. K. Kim, 'Determination of the exciton recombination zone in white OLEDs based on a blue emitting layer of 4'4-Bis(2,2'-Diphenyl Vinyl)-1 ,1'-Biphenyll', J. Kor. Phys. Soc., Vol. 49, p. 1247, 2006
  6. J. H. Seo, J. H. Seo, J. H. Park, J. H. Kim, G. W. Hyung, K. H. Lee, S. S. Yoon, and Y. K. Kim, 'Highly efficient white organic light-emitting diodes using two emitting materials for three primary colors (red, green, and blue)', Appl. Phys. Lett., Vol. 90, p. 203507, 2007 https://doi.org/10.1063/1.2740191
  7. W. D'Andrade, M. E. Thompson, and S. R. Forrest, 'Controlling exciton diffusion in multilayer white phosphorescent organic light emitting devices', Adv. Mater., Vol. 14, p. 147, 2002
  8. S. Tokito, T. Iijima, T. Tsuzuki, and F. Sato, 'Highefficiency white phosphorescent organic light-emitting devices with greenish-blue and red-emitting layers', Appl. Phys. Lett., Vol. 83, p. 2459, 2003 https://doi.org/10.1063/1.1611620
  9. G. Lei, L. Wang, and Y. Qui, 'Multilayer organic electrophosphorescent white light-emitting diodes without exciton-blocking layer', Appl. Phys. Lett., Vol. 88, p. 103508, 2006 https://doi.org/10.1063/1.2185255
  10. H. H. Fong, Wallace C. H. Choy, K. N. Hui, and Y. J. Liang 'Organic light-emitting diodes based on a cohost electron transporting composite', Appl. Phys. Lett., Vol. 88, p. 103510, 2006
  11. S. Naka, H. Okada, H. Onnagawa, and T. Tsutsui, 'High electron mobility in bathophenanthroline', Appl. Phys. Lett., Vol. 76, p. 197, 2000

피인용 문헌

  1. Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes vol.20, pp.12, 2015, https://doi.org/10.3390/molecules200713005