Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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The Characteristics of Organic Light-emitting Diodes With a New Blue Phosphorescent Material

새로운 청색의 인광 물질을 어용한 유기 발광 소자의 전기적 특성 및 수명에 대한 연구

  • Kim, Y.K. (Department of Information Display, Hongik University, Center for Organic Materialsand Information Devices, Hongik University) ;
  • Park, J.H. (Department of Information Display, Hongik University, Center for Organic Materialsand Information Devices, Hongik University) ;
  • Seo, J.H. (Department of Information Display, Hongik University, Center for Organic Materialsand Information Devices, Hongik University) ;
  • Seo, J.H. (Department of Information Display, Hongik University, Center for Organic Materialsand Information Devices, Hongik University) ;
  • Han, J.W. (Department of Chemistry, Konkuk University) ;
  • Im, C. (Department of Chemistry, Konkuk University) ;
  • Han, S.H. (Department of Chemical System Engineering, Hongik University) ;
  • Lee, S.H. (Department of Chemical System Engineering, Hongik University)
  • 김영관 (홍익대학교 정보디스플레이공학과, 유기소재 및 정보소자 센터) ;
  • 박정현 (홍익대학교 정보디스플레이공학과, 유기소재 및 정보소자 센터) ;
  • 서지훈 (홍익대학교 정보디스플레이공학과, 유기소재 및 정보소자 센터) ;
  • 서지현 (홍익대학교 정보디스플레이공학과, 유기소재 및 정보소자 센터) ;
  • 한정욱 (건국대학교 화학과) ;
  • 임찬 (건국대학교 화학과) ;
  • 한승훈 (홍익대학교 화학시스템공학과) ;
  • 이승희 (홍익대학교 화학시스템공학과)
  • Published : 2007.03.31
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Abstract

A new blue phosphorescent material for organic light emitting diodes (OLEDs), Iridium(III)bis[2-(4-fIuoro-3-benzonitrile)-pyridinato-N,C2'] picolinate (Firpic-CN), was synthesized and studied. We compared characteristics of Firpic-CN and Bis(3,5-Difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl) iridium III (FIrpic) which has been used for blue dopant materials frequently. The devices structure were indium tin oxide (ITO) (1000 ${\AA}$)/N,N'-diphenyl-N,N'-(2-napthyl)-(1,1'-phenyl)-4,4'-diamine (NPB) (500 ${\AA}$)/4,4'-N,N'-dicarbazole-biphyenyl (CBP) : FIrpic and FIrpic-CN (X wt%)/4,7-diphenyl-1,10-phenanthroline (BPhen) (300 ${\AA}$)/lithum quinolate (Liq) (20 ${\AA}$)/Al (1000 ${\AA}$). 15 wt% FIrpic-CN doped device exhibits a luminance of $1450\;cd/m^2$ at 12.4 V, luminous efficiency of 1.31 cd/A at $3.58mA/cm^2$, and Commission Internationale d'Eclairage $(CIE_{x,y})$ coordinates of (0.15, 0.12) at 12 V which shows a very deep blue emission. We also measured lifetime of devices and was presented definite difference between devices of FIrpic and FIrpic-CN. Device with FIrpic-CN as a dopant presented lower longevity due to chemical effect of CN ligand.

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References

  1. C. W. Tang, and S. A. Vanslyke, Appl. Phys. Lett. 51, 913 (1987) https://doi.org/10.1063/1.98799
  2. J. Kido, M. Kimura, and K. Nagai, Science 267, 1332 (1995) https://doi.org/10.1126/science.267.5202.1332
  3. H. K. Lee, J. H. Seo, J. H. Kim, J. R. Koo, K. H. Lee, S. S. Yoon, and Y. K. Kim, J. Korean Phys. Soc. 49, 1052 (2006)
  4. S. Y. Kim, H. Y. Shim, J. H. Seo, and Y. K. Kim, J. Kor. Phys. Soc. 49, 1247 (2006)
  5. M. Y. Yang, S. H. Youn, Y. C. Kim, and Y. K. Kim, A Study on the Improved OLEDs Performance Using the Oxygen Plasma Treatment, Pro. of KOCS Int. Sym. P-19 (2005)
  6. C. Adachi, R. Kwong, and S. R. Forrest, Organic Electronics, 2, 37 (2001) https://doi.org/10.1016/S1566-1199(01)00010-6
  7. M. Y. Chan, C. S. Lee, S. L. Lai, M. K. Fung, F. L. Wong, H. Y. Sun, K. M. Lau, and S. T. Lee, Appl. Phys. Lett. 100, 094506 (2006)
  8. Y.J. Tung, T. Ngo, M. Hack, J. Brown, N. Koide, Y. Nagara, Y. Kato, and H. Ito, A High Efficiency Phosphorescent White OLED for LCD Backlight and Display Applications, SID Int Symp. Digest Tech Papers, 48 (2004)