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

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of Doping Profile of Blue Activator on the Emission Characteristics of White Organic Light Emitting Diodes

청색 활성제의 첨가 형상 변화에 따른 백색 OLED의 발광 특성

  • Lim, Byung-Gwan (Department of Electronic Engineering, Daejin University) ;
  • Seo, Jung-Hyun (Department of Advanced Materials Science & Engineering, Daejin University) ;
  • Paek, Kyeong-Kap (Department of Electronic Engineering, Daejin University) ;
  • Ju, Sung-Hoo (Department of Advanced Materials Science & Engineering, Daejin University)
  • Received : 2011.05.11
  • Accepted : 2011.05.19
  • Published : 2011.06.01
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Abstract

To investigate the effect of two-emission-layer structure on the emission characteristics of the phosphorescent white organic light-emitting diodes (PHWOLEDs), the PHWOLEDs with two different emission layers, blue EML(29 nm, FIrpic-doped mCP) and red EML(1 nm, Ir(pq)$_2$acac-doped CBP)), following host-guest system were fabricated. The bi-layered blue EML was composed of mCP:FIrpic (20 nm, 7 vol.%) and mCP:FIrpic (9 nm, 7, 10, 15, 20, and 25 vol.%, respectively). When the concentration of FIrpic was increased from 7 to 15 vol.%, light emission luminance, current efficiency, and external quantum efficiency were increased. On the contrary, when the concentration of FIrpic was increased to more than 20 vol.%, light emission luminance, current efficiency, and external quantum efficiency were decreased. The PHWOLEDs with the bi-layered blue EML structure of mCP:FIrpic (20 nm, 7 vol.%) and mCP:FIrpic (9 nm, 15 vol.%) showed current efficiency of 29.7 cd/A and external quantum efficiency (EQE) of 16.6% at 1,000 $cd/cm^2$.

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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. T. Tsuboi, H. Murayama, S. J. Yeh, and C. T. Chen, Opt. Mater., 29, 1299 (2007). https://doi.org/10.1016/j.optmat.2006.06.005
  4. V. Sivasubramaniam, F. Brodkorb, S. Hanning, H. P. Loebl, V. van Elsbergen, H. Boerner, U. Scherf, and M. Kreyenschmidt, J. Fluor. Chem., 130, 640 (2009). https://doi.org/10.1016/j.jfluchem.2009.04.009
  5. J. H. Seo, Y. K. Kim, and Y. Ha, Thin Solid Films, 517, 1807 (2009). https://doi.org/10.1016/j.tsf.2008.09.075
  6. S. Tokito, C. Adachi, and H. Murata, Organic Electro luminescence Display (Seong An Dang, 2006) p. 100.
  7. N. Tamoto, C. Adachi, and K. Nagai, Chem. Mater., 9, 1077 (1997). https://doi.org/10.1021/cm960391+
  8. G. Lei, L. Wang, and Y. Qiu, Appl. Phys. Lett., 88, 103508 (2006). https://doi.org/10.1063/1.2185255
  9. S. S. Lee, T. J. Song, and S. M. Cho, Mater. Sci. Eng. B, 95, 24 (2002). https://doi.org/10.1016/S0921-5107(02)00087-9
  10. J. Tardy, M. Ben Khalifa, and D. Vaufrey, Mater. Sci. Eng. C, 26, 196 (2006). https://doi.org/10.1016/j.msec.2005.10.061
  11. M. Ben Khalifa, D. Vaufrey, and J. Tardy, Org. Electron., 5, 187 (2004). https://doi.org/10.1016/j.orgel.2003.11.006
  12. K. S. Yook, S. O. Jeon, C. W. Joo, and J. Y. Lee, Appl. Phys. Lett., 93, 113301 (2008). https://doi.org/10.1063/1.2982917
  13. H. I. Baek and C. H. Lee, J. Phys. D: Appl. Phys., 41, 105101 (2008). https://doi.org/10.1088/0022-3727/41/10/105101
  14. J. Lee, J. I. Lee, and H. Y. Chu, Synth. Met., 159, 991 (2009). https://doi.org/10.1016/j.synthmet.2008.12.031
  15. Y. Sun and S. R. Forrest, Appl. Phys. Lett., 91, 263503 (2007). https://doi.org/10.1063/1.2827178
  16. C. H. Hsiao, J. H. Lee, and C. A. Tseng, Chem. Phys. Lett., 427, 305 (2006). https://doi.org/10.1016/j.cplett.2006.06.073
  17. B. G. Lim, J. H. Seo, S. H. Ju, and K. K. Paek, J. KIEEME, 23, 983 (2010).
  18. N. Matsusue, Y. Suzuki, and H. Naito, Jpn. J. Appl. Phys., 44, 3691 (2005). https://doi.org/10.1143/JJAP.44.3691
  19. T. Tsuboi, S. W. Liu, M. F. Wu, and C. T. Chen, Org. Electron., 10, 1372 (2009). https://doi.org/10.1016/j.orgel.2009.07.020
  20. K. J. Han and K. Y. Kay, J. Korean Chem. Soc. 49, 2 (2005).
  21. A. Debuigne, Y. Champouret, R. Jerome, R. Poli, and C. Detrembleur, Chem. Eur. J., 14, 4046 (2008). https://doi.org/10.1002/chem.200701867