Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
권호 표지
DOI QR코드

DOI QR Code

White Organic Light-Emitting Diodes with Color Stability

  • Published : 2009.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The authors have demonstrated white oraganic light-emitting diodes (WOLED) using 1,4-bis[2-(4'-diphenylaminobiphenyl-4-yl)vinyl]benzene as fluorescent blue emitter and iridium(III) bis(5-acetyl-2-phenylpyridinato-N,C2') acetylacetonate as phosphorescent red emitter. The optimized WOLED using red host material as bis(2-methyl-8-quinolinato) -4-phenylphenolate exhibited proper color stability in comparison with the control device using 4,4'-N,N'-dicarbazole-biphenyl as red host. The white device showed a maximum luminance of 21100 $cd/m^2$ at 14 V, luminous efficiency of 9.7 cd/A at 20 $mA/cm^2$, and Commission Internationale de I'Eclairage ($CIE_{x,y}$)coordinates of (0.32, 0.34) at 1000 $cd/m^2$. The devices also exhibited the color shift with ${\Delta}CIE_{x,y}$ coordinates of ${\pm}$ (0.01,0.01) from 100 to 20000 $cd/m^2$.

Keywords

References

  1. C. W. Tang and S. A VanSlyke, Organic electroluminescent diodes, Appi, Phys,Lett. 51, 913 (1987) https://doi.org/10.1063/1.98799
  2. G. W. Hyung, I. H. Park, j. H. Seo, j. H. Seo, W. Y. Kim, and Y. K. Kim,Investigation of top-contact organic field effect transistors by the treatment usingthe VDP process on dielectric, J Kor. Oil Chern Soc. 24, 54 (2007)
  3. J. H. Park, J. H. Seo, J. H. Seo, J. W. Han, C. Im, S. H. Han, S. H. Lee, Y. K.Kim, The chatacteristics of organic light-emitting diodes with a new bluephosphorescent material, J Kor. Oil Chern Soc. 24, 74 (2007)
  4. C. C. Wu, Y. T. Lin, K. T. Wong, R. T. Chen, and Y. Y. Chien, Efficient OrganicBlue-Light-Emitting Devices with Double Confinement on Terfluorenes withAmbipolar Carrier Transport Properties, Adu. Mater. 16, 61 (2004) https://doi.org/10.1002/adma.200305619
  5. Y. K. Kim, Y. S. Kim, and J. H. Seo, A study on Energy levels and electronstates of organic light-emitting materials, J KaT. Oil Chern Soc. 22, 299 (2005)
  6. R. F. Service, Organic Light Emitters Gain Longevity, Science 273, 878 (1996) https://doi.org/10.1126/science.273.5277.878
  7. B. W. D' Andrade, R. J. Holmes, and S. R. Forrest, Efficient OrganicElectrophosphorescent White-LightEmitting Device with a Triple DopedEmissi ve Layer, Adv. Mater. 16, 624 (2004) https://doi.org/10.1002/adma.200306670
  8. R. F. Service, Electronics: Organic LEDs Look Forward to a Bright, White Future,Science, 310, 1762 (2005) https://doi.org/10.1126/science.310.5755.1762
  9. Y. S. Wu, S. W. Hwang, H. H. Chen, M. T. Lee, W. J. Shen, and C. H. Chen, Efficient white organic light emitting devices with dual emitting layers, Thin Solid Film, 488, 265 (2005)
  10. B. W. D' Andrade and S. R. Forrest, White Organic Light-Emitting Devices forSolid-State Lighting, Adv. Mater. 16, 1585 (2004) https://doi.org/10.1002/adma.200400684
  11. J. Y. Li, D. Liu, C. Ma, O. Lengyel, C. S. Lee, C. H. Tung and S. Lee, White-Light Emission from a Single-EmittingComponent Organic ElectroluminescentDevice, Adv. Mater. 16, 1538 (2004) https://doi.org/10.1002/adma.200305838
  12. G. Lei, L. Wang, and Y. Qiu, Multilayer organic electrophosphorescent white lightemitting diodes without exciton-blocking layer, Appl. Phys. Lett. 88,103508 (2006) https://doi.org/10.1063/1.2185255
  13. J. H. Seo, J. S. Park, G. W. Hyung, J. H. Seo, K. H. Lee, S. S. Y oon, and Y. K.Kim, A hybrid spacer effect on white organic light-emitting diodes withphosphorescent emitters, J Kor. Oil Chern Soc. 26, 24 (2009)
  14. S. P. Singh, Y. N. Mohaparta, M. Qureshi, and S. S. Manoharan, Whiteorganic light-emitting diodes based on spectral broadening in electroluminescence due to formation of interfacial exciplexes, Appl. Phys. Lett 86, 113505 (2005) https://doi.org/10.1063/1.1884255
  15. B. W. D'Andrade, J. brooks, V. Adamovich, M. E. Thompson, and S. R.Forrest, White Light Emission Using Triplet Excimers in ElectrophosphorescentOrganic Light-Emitting Devices, Adv. Mater. 14, 1032 (2002) https://doi.org/10.1002/1521-4095(20020805)14:15<1032::AID-ADMA1032>3.0.CO;2-6
  16. C. C. Wu, J C. Sturm and A. Khan, White Light Emission Using TripletExcimers in Electrophosphorescent Organic Light-Emitting Devices, Appl.Phys. Lett. 70, 1348 (1997) https://doi.org/10.1063/1.118575
  17. S. Han, L. Wang, G. Lei, and Y. Qin, A Study on the Performances of WhiteOrganic Light-Emitting Diodes and the Morphologies of Their Hole-BlockingLayers, jpn. J Appl. Phys. 44. 182 (2005) https://doi.org/10.1143/JJAP.44.L182