ETRI Journal

Electronics and Telecommunications Research Institute (한국전자통신연구원)
권호 표지
DOI QR코드

DOI QR Code

Improved Performance of White Phosphorescent Organic Light-Emitting Diodes through a Mixed-Host Structure

  • Lee, Jong-Hee (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Lee, Jeong-Ik (Convergence Components & Materials Research Laboratory, ETRI) ;
  • Chu, Hye-Yong (Convergence Components & Materials Research Laboratory, ETRI)
  • Received : 2009.04.01
  • Accepted : 2009.06.04
  • Published : 2009.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Highly efficient white phosphorescent organic light-emitting diodes with a mixed-host structure are developed and the device characteristics are studied. The introduction of a hole-transport-type host (N, N'-dicarbazolyl-3-3-benzen (mCP)) into an electron-transport-type host (m-bis-(triphenylsilyl)benzene (UGH3)) as a mixed-host emissive layer effectively achieves higher current density and lower driving voltage. The peak external quantum and power efficiency with the mixed-host structure improve up to 18.9% and 40.9 lm/W, respectively. Moreover, this mixed-host structure device shows over 30% enhanced performance compared with a single-host structure device at a luminance of 10,000 $cd/m^2$ without any change in the electroluminescence spectra.

Keywords

References

  1. M.A. Baldo et al., "Highly Efficient Phosphorescent Emission from Organic Electroluminescent Devices,' Nature, vol. 395, 1998, pp. 151-154. https://doi.org/10.1038/25954
  2. J.-H. Shin et al., "Light Effects on the Bias Stability of Transparent ZnO Thin Film Transistors," ETRI Journal, vol. 31, no. 1, 2009, pp. 62-64. https://doi.org/10.4218/etrij.09.0208.0266
  3. B.W. D'Andrade and S.R. Forrest, "White Organic Light-Emitting Devices for Solid-State Lighting," Adv. Mater., vol. 16, 2004, pp. 1585-1595. https://doi.org/10.1002/adma.200400684
  4. Y.S. Park et al., "Efficient, Color Stable White Organic Light-Emitting Diodes Based on High Energy Level Yellowish-Green Dopants," Adv. Mater., vol. 20, 2008, pp. 1957-1691. https://doi.org/10.1002/adma.200702435
  5. S.R. Forrest, "The Road to High Efficiency Organic Light Emitting Devices," Org. Electron., vol. 4, 2003, pp. 45-48. https://doi.org/10.1016/j.orgel.2003.08.014
  6. B.W. D'Andrade, R.J. Holmes, and S.R. Forrest, "Efficient Organic Electrophosphorescent White-Light-Emitting Device with a Triple Doped Emissive Layer," Adv. Mater., vol. 16, 2004, pp. 624-628. https://doi.org/10.1002/adma.200306670
  7. J. Lee et al., "Improvements of Phosphorescent White OLEDs Performance for Lighting Application," J. Nanoscience and Nanotechnology, vol. 8, no. 10, 2008, pp. 5185-5187. https://doi.org/10.1166/jnn.2008.1428
  8. H. Aziz et al., "Degradation Mechanism of Small Molecule-Based Organic Light-Emitting Devices," Science, vol. 283, 1999, pp. 1900-1902. https://doi.org/10.1126/science.283.5409.1900
  9. Y.G. Lee et al., "Fabrication of Highly Efficient and Stable Doped Red Organic Light-Emitting Device Using 2-methyl-9, 10-di(2-napthyl)antracene and tris(8-hydroxyquinolinato)Aluminum as Cohost Material," Appl. Phys. Lett., vol. 89, 2006, pp. 183515-1-3. https://doi.org/10.1063/1.2374811
  10. S.H. Kim, J. Jang, and J.Y. Lee, "Relationship between Host Energy Levels and Device Performances of Phosphorescent Organic Light-Emitting Diodes with Triplet Mixed Host Emitting Structure," Appl. Phys. Lett., vol. 91, 2007, pp. 083511-1-3. https://doi.org/10.1063/1.2773941
  11. S.H. Kim et al., "Stable Efficiency Roll-off in Phosphorescent Organic Light-Emitting Diodes," Appl. Phys. Lett., vol. 92, 2008, pp. 023513-1-3. https://doi.org/10.1063/1.2836270
  12. H.A. Al Attar et al., "White Polymeric Light-Emitting Diodes Based on a Fluorine Polymer/Ir Complex Blend System," Appl. Phys. Lett., vol. 86, 2005, pp. 121101-1-3. https://doi.org/10.1063/1.1873046
  13. J. Lee et al., "Effects of Interlayers on Phosphorescent Blue Organic Light-Emitting Diodes," Chem. Phys. Lett., vol. 92, 2008, pp. 203305-1-3.
  14. X. Ren et al., "Ultrahigh Energy Gap Host in Deep Blue Organic Electrophosphorescent Devices," Chem. Mater., vol 16, no. 23, 2004, pp. 4743-4747. https://doi.org/10.1021/cm049402m
  15. R.J. Holmes et al., "Efficient, Deep-Blue Organic Electrophosphorescence by Guest Charge Trapping," Appl. Phys. Lett., vol. 83, 2003, pp. 3818-3820. https://doi.org/10.1063/1.1624639
  16. R.J. Homes et al., "Blue Organic Electrophosphorescence Using Exothermic Host-Guest Energy Transfer," Appl. Phys. Lett., vol. 82, 2003, pp. 2422-2424. https://doi.org/10.1063/1.1568146
  17. J. Lee et al., "Influence of Doping Profile on the Efficiency of Blue Phosphorescent Organic Light-Emitting Diodes," Appl. Phys. Lett., vol. 92, 2008, pp. 133304-1-3. https://doi.org/10.1063/1.2904632
  18. M.A. Baldo, C. Adachi, and S.R. Forrest, "Transient Analysis of Organic Electrophosphorescence, II. Transient Analysis of Triplet-Triplet Annihilation," Phys. Rev. B, vol. 62, 2000, pp. 10967-10977. https://doi.org/10.1103/PhysRevB.62.10967
  19. S. Reineke, K. Walzer, and K. Leo, "Triplet-Exciton Quenching in Organic Phosphorescent Light-Emitting Diodes with Ir-Based Emitters," Phys. Rev. B, vol. 75, 2007, pp. 125328-1-13. https://doi.org/10.1103/PhysRevB.75.125328

Cited by

  1. Wireless Power Transmission to Organic Light Emitting Diode Lighting Panel with Magnetically Coupled Resonator vol.51, pp.9, 2009, https://doi.org/10.7567/jjap.51.09mh05
  2. Simultaneously enhanced device efficiency, stabilized chromaticity of organic light emitting diodes with lambertian emission characteristic by random convex lenses vol.27, pp.7, 2016, https://doi.org/10.1088/0957-4484/27/7/075202
  3. Significant Enhancement in Quantum Dot Light-Emitting Device Stability via a Cascading Hole Transport Layer vol.12, pp.14, 2009, https://doi.org/10.1021/acsami.9b23567
  4. A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes vol.8, pp.15, 2009, https://doi.org/10.1039/c9tc06702g
  5. A negative polaron resistant p-type host for extended lifetime in deep blue phosphorescent organic light-emitting diodes vol.8, pp.15, 2009, https://doi.org/10.1039/c9tc06702g
  6. Color-stable white phosphorescent organic light-emitting diodes based on double bipolar mixed-host layer vol.53, pp.25, 2009, https://doi.org/10.1088/1361-6463/ab8037