Quick Search: Journal  Author  Title/Abstract  Vol./Year 

Jpn. J. Appl. Phys. 46 (2007) pp. 1186-1188  |Previous Article| |Next Article|  |Table of Contents|
|Full Text PDF (144K)| |Buy This Article|

Brief Communication

High-Efficiency Green Phosphorescent Organic Light-Emitting Devices with Chemically Doped Layers

Soichi Watanabe1, Nobuhiro Ide2, and Junji Kido1,2,3

1Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata 992-8510, Japan
2Optoelectronic Industry and Technology Development Association, Bunkyo-ku, Tokyo 112-0014, Japan
3Research Institute for Organic Electronics, Yonezawa, Yamagata 992-1128, Japan

(Received November 13, 2006; revised November 23, 2006; accepted November 29, 2006; published online March 8, 2007)

We have developed green phosphorescent organic light-emitting devices (OLEDs) with high quantum and luminous efficiencies. A green phosphorescent metal complex, fac-tris(2-phenylpyridine) iridium [Ir(ppy)3], was used as an emitter material. Wide-energy-gap materials with high triplet excited energy levels were used as host materials for Ir(ppy)3 and as carrier transport materials. Hole injection and electron injection from the electrodes were balanced by placing chemically doped layers at the interface between the electrodes and the organic layers. In addition, a highly reflective Ag cathode was employed as an anode, instead of a conventional Al cathode to enhance the reflectivity of the cathode metal. An optimized device exhibited an external quantum efficiency (EQE) of 27% (95 cd/A) and a high power efficiency of 97 lm/W at 100 cd/m2 at 3.1 V.

URL: http://jjap.jsap.jp/link?JJAP/46/1186/
DOI: 10.1143/JJAP.46.1186


|Full Text PDF (144K)| |Buy This Article| Citation:

References | Citing Articles (52)

  1. C. W. Tang and S. A. VanSlyke: Appl. Phys. Lett. 51 (1987) 913[AIP Scitation].
  2. J. H. Burroughes, D. D. C. Bradley, A. R. Brown, R. N. Marks, K. Mackay, R. H. Friend, P. L. Burns, and A. B. Holmes: Nature 347 (1990) 539[CrossRef].
  3. J. Kido, M. Kimura, and K. Nagai: Science 267 (1995) 1332[Science].
  4. J. Kido, T. Matsumoto, T. Nakada, J. Endo, K. Mori, N. Kawamura, and A. Yokoi: SID Int. Symp. Dig. Tech. Pap. 34 (2003) 964.
  5. J. Kido: Phys. World 12 (1999) 27.
  6. R. F. Service: Science 310 (2005) 1762[Science].
  7. M. A. Baldo, S. Lamansky, P. E. Burrows, M. E. Thompson, and S. R. Forrest: Appl. Phys. Lett. 75 (1999) 4[AIP Scitation].
  8. M. A. Baldo, M. E. Thompson, and S. R. Forrest: Nature 403 (2000) 750[CrossRef].
  9. M. Ikai, S. Tokito, Y. Sakamoto, T. Suzuki, and Y. Taga: Appl. Phys. Lett. 79 (2001) 156[AIP Scitation].
  10. A. Fukase and J. Kido: Polym. Adv. Technol. 13 (2002) 601.
  11. C. Adachi, M. A. Baldo, M. E. Thompson, and S. R. Forrest: J. Appl. Phys. 90 (2001) 5048[AIP Scitation].
  12. S. Watanabe, Y. Agata, D. Tanaka, and J. Kido: J. Photopolym. Sci. Technol. 18 (2005) 83.
  13. C. Adachi, R. C. Kwong, P. Djurovich, V. Adamovich, M. A. Baldo, M. E. Thompson, and S. R. Forrest: Appl. Phys. Lett. 79 (2001) 2082[AIP Scitation].
  14. R. J. Holmes, S. R. Forrest, Y.-J. Tung, R. C. Kwong, J. J. Brown, S. Garon, and M. E. Thompson: Appl. Phys. Lett. 82 (2003) 2422[AIP Scitation].
  15. J. Kido and T. Matsumoto: Appl. Phys. Lett. 73 (1998) 2866[AIP Scitation].
  16. J. Endo, T. Matsumoto, and J. Kido: Jpn. J. Appl. Phys. 41 (2002) L358[JSAP].
  17. Y. Sato, T. Ogata, and J. Kido: Proc. SPIE 4105 (2000) 134[AIP Scitation].
  18. X. Zhou, M. Pfeiffer, J. Blochwitz, A. Werner, A. Nollau, T. Fritz, and K. Leo: Appl. Phys. Lett. 78 (2001) 410[AIP Scitation].
  19. T. Watanabe, K. Nakamura, S. Kawami, Y. Fukuda, T. Tsuji, T. Wakimoto, S. Miyaguchi, M. Yahiro, M.-J. Yang, and T. Tsutsui: Synth. Met. 122 (2001) 203[CrossRef].
  20. M. Yahiro: Dr. Thesis, Interdisciplinary Graduate School of Engineering Sciences, Kyusyu University, Japan (2001) [in Japanese].
  21. T. Shiga, S. Tokito, and Y. Taga: Proc. Int. Workshop Electroluminescence, Hamamatsu, Japan, 2000, p. 179.
  22. H. Mattoussi, H. Murata, C. D. Merritt, Y. Iizumi, J. Kido, and Z. H. Kafafi: J. Appl. Phys. 86 (1999) 2642[AIP Scitation].
  23. Y. Kawamura, K. Goushi, J. Brooks, J. J. Brown, H. Sasabe, and C. Adachi: Appl. Phys. Lett. 86 (2005) 071104[AIP Scitation].
  24. S. Watanabe, N. Ide, and J. Kido: Material Research Society Fall Meet., 2005, D3.23.
  25. D. E. Gray: American Institute of Physics Handbook (McGraw-Hill, New York, 1982) 3 ed., p. 6.
|TOP|  |Previous Article| |Next Article|  |Table of Contents| |JJAP Home|
Copyright © 2013 The Japan Society of Applied Physics
Contact Information