마이크로전자및패키징학회지 (Journal of the Microelectronics and Packaging Society)

  • 제18권4호
  • /
  • Pages.79-83
  • /
  • 2011
  • /
  • 1226-9360(pISSN)
  • /
  • 2287-7525(eISSN)
한국마이크로전자및패키징학회 (The Korean Microelectronics and Packaging Society)
권호 표지
DOI QR코드

DOI QR Code

Preparation and Characterization of White Phosphorescence Polymer Light Emitting Diodes Using PFO:Ir(ppy)3:MDMO-PPV Emission Layer

  • 투고 : 2011.12.15
  • 심사 : 2011.12.28
  • 발행 : 2011.12.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

White phosphorescence polymer light emitting diodes (WPhPLEDs) with a glass/ITO/PEDOT:PSS/PFO:$Ir(ppy)_3$:MDMO-PPV/TPBI/LiF/Al structure were fabricated to investigate the effects of $Ir(ppy)_3$ doping concentrations on the optical and electrical properties of the devices. PFO, $Ir(ppy)_3$ and MDMO-PPV conjugated polymers as host and guest materials in the emission layer were spin coated at various concentrations of $Ir(ppy)_3$ ranging from 0.0 to 20.0 vol.%. As the concentration of $Ir(ppy)_3$ increased from 5.0 to 20.0 vol.%, the luminance and current efficiency values of the devices decreased clearly, which are attributable to the quenching effect at a high doping concentration. The maximum luminance and current density were 2850 $cd/m^2$ and 741 $mA/cm^2$, respectively for a WPhPLED with an $Ir(ppy)_3$ concentration of 5.0 vol.%. The CIE color coordinates were about x=0.33 and y=0.34 at 11V, showing a good white color.

키워드

참고문헌

  1. S. B. Shin, S. C. Gong, H. K. Lee, J. G. Jang, M. S. Gong, S. O. Ryu, J. Y. Lee, Y. C. Chang and H. J. Chang, "Improving Light Efficiency of White Polymer Light Emitting Diodes by Introducing the TPBi Exciton Protection Layer", Thin Solid Films, 517, 4143 (2009). https://doi.org/10.1016/j.tsf.2009.02.027
  2. F. Villani, P. Vacca, G. Nenna, O. Valentino, G. Burrasca, T. Fasolino, C. Minarini and D. D. Sala, "Inkjet Printed Polymer Layer on Flexible Substrate for OLED Applications", J. Phys. Chem. C., 113, 13398 (2009). https://doi.org/10.1021/jp8095538
  3. Y. W. Park, Y. M. Kim, J. H. Choi, T. H. Park, J. W. Jeong, M. J. Cho, D. H. Choi and B. K. Ju, "Electroluminescence Property of Highly Soluble Ir(III) Complex Utilized by Various Hole Blocking Layers in Polymer Light Emitting Diodes", J. Nanosci. Nanotechnol., 10, 3250 (2010). https://doi.org/10.1166/jnn.2010.2279
  4. S. C. Gong and H. J. Chang, "The Properties of Polymer Light Emitting Diodes with ITO/PEDOT:PSS/MEH-PPV/Al Structure", J. Microelectron. Packag. Soc., 12(3), 213 (2005).
  5. J. H. Yoo and H. J. Chang, "Preparation of Polymer Light Emitting Diodes with PFO-poss Organic Emission Layer on ITO/Glass Substrates", J. Microelectron. Packag. Soc., 13(4), 51 (2006).
  6. C. H. Ku, C. H. Kuo, M. K. Leung and K. H. Hsieh, "Carbazole- oxadiazole Containing Polyurethanes as Phosphorescent Host for Organic Light Emitting Diodes", Eur. Polym. J., 45, 1545 (2009). https://doi.org/10.1016/j.eurpolymj.2009.01.024
  7. W. Zhu, W. Mo, M. Yuan, W. Yang and Y. Cao, "Highly Efficient Electrophosphorescent Devices Based on Conjugated Polymers Doped with Iridium Complexes", Appl. Phys. Lett., 80, 2045 (2002). https://doi.org/10.1063/1.1461418
  8. C. Adachi, M. A. Baldo, M. E. Thompson and S. R. Forrest, "Nearly 100% Internal Phosphorescence Efficiency in an Organic Light Emitting Device", J. Appl. Physics, 90, 5048 (2001). https://doi.org/10.1063/1.1409582
  9. J. H. Lee, H. Y. Chu, J. I. Lee, K. I. Song and S. J. Lee, "Improvements of Phosphorescent White OLEDs Performance for Lighting Application", J. Nanosci. Nanotechnol., 8, 5185 (2008). https://doi.org/10.1166/jnn.2008.1428
  10. J. Li, T. Sano, Y. Hirayama and K. Shibata, "White Polymer Light Emitting Diodes with Multi-layer Device Structure", Synthetic Met., 159, 36 (2009). https://doi.org/10.1016/j.synthmet.2008.07.010
  11. S. J. Martin, R. A. L. Jones, M. Geoghegan, A. M. Higgins, I. Grizzi, J. J. M. Halls, S. Kirchmeyer and R. M. Dalgliesh, "Current-induced Chain Migration in Semiconductor Polymer Blends", Phys. Rev. B., 71, 081308(R) (2005). https://doi.org/10.1103/PhysRevB.71.081308
  12. J. Wang, J. Yu, L. Li, X. Tang and Y. Jiang, "Efficient White Organic Light-emitting Devices Using a Thin 4,4'-bis(2,2'-diphenylvinyl)-1,1'-diphenyl Layer", J. Phys. D: Appl. Phys.,41, 045104 (2008). https://doi.org/10.1088/0022-3727/41/4/045104
  13. S. Tokito, C. Adachi and H. Murata, Organic Electroluminescence Display (in Japan), pp.85-86, Ohmsha, Tokyo (2004).
  14. H. M. Lee, H. H. Park, H. Jeon, Y. C. Chang and H. J. Chang, "Preparation and Characterization of Phosphorescence Organic Light-emitting Diodes Using Poly-vinylcarbazole: Tris(2-phenylpyridine) Iridium(III) Emission Layer", Opt. Eng., 48(10), 104001 (2009). https://doi.org/10.1117/1.3251325
  15. S. Miyata and H. S. Nalwa, Organic Electroluminescent Materials and Devices, pp.237-239, Gordon and Breach Science Publishers, Amsterdam (1997).
  16. D. Beljonne, J. Cornil, R. H. Friend, R. A. Janssen and J. L. Brédas, "Influence of Chain Length and Derivatization on the Lowest Singlet and Triplet States and Intersystem Crossing in Oligothiophenes", J. Am. Chem. Soc., 118, 6453 (1996). https://doi.org/10.1021/ja9531135
  17. S. Lamansky, R. C. Kwong, M. Nugent, P. I. Djurovich and M. E. Thompson, "Molecularly Doped Polymer Light Emitting Diodes Utilizing Phosphorescent Pt(II) and Ir(III) Dopants", Org. Electron., 2, 53 (2001). https://doi.org/10.1016/S1566-1199(01)00007-6