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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S2 — Mar. 12, 2012
  • pp: A309–A317

Improved light extraction efficiency in organic light emitting diodes with a perforated WO3 hole injection layer fabricated by use of colloidal lithography

Chung Sock Choi, Sung-Min Lee, Myung Sub Lim, Kyung Cheol Choi, Donghyuk Kim, Duk Young Jeon, Youngjo Yang, and O Ok Park  »View Author Affiliations

Optics Express, Vol. 20, Issue S2, pp. A309-A317 (2012)

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We present an organic light emitting diode with a perforated WO3 hole injection layer to improve the light extraction efficiency. The two-dimensionally perforated WO3 layer was fabricated by use of colloidal lithography. The light extraction efficiency was improved due to Bragg scattering of waveguide modes and surface plasmon polaritons, and the operating voltage was also decreased. As a result, the external quantum efficiency and the power efficiency were increased as compared with those of conventional organic light emitting diodes without WO3 layer. The angular dependence of emission characteristics was investigated by measuring radiant intensity profiles for emission angles and azimuthal angles.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Light-Emitting Diodes

Original Manuscript: December 2, 2011
Revised Manuscript: February 16, 2012
Manuscript Accepted: February 18, 2012
Published: March 5, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics

Chung Sock Choi, Sung-Min Lee, Myung Sub Lim, Kyung Cheol Choi, Donghyuk Kim, Duk Young Jeon, Youngjo Yang, and O Ok Park, "Improved light extraction efficiency in organic light emitting diodes with a perforated WO3 hole injection layer fabricated by use of colloidal lithography," Opt. Express 20, A309-A317 (2012)

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  1. R. Meerheim, M. Furno, S. Hofmann, B. Lüssem, and K. Leo, “Quantification of energy loss mechanisms in organic light-emitting diodes,” Appl. Phys. Lett.97(25), 253305 (2010). [CrossRef]
  2. K. Saxena, V. K. Jain, and D. S. Mehta, “A review on the light extraction techniques in organic electroluminescent devices,” Opt. Mater.32(1), 221–233 (2009). [CrossRef]
  3. P. A. Hobson, J. A. E. Wasey, I. Sage, and W. L. Barnes, “The role of surface plasmons in organic light-emitting diodes,” IEEE J. Sel. Top. Quantum Electron.8(2), 378–386 (2002). [CrossRef]
  4. C. F. Madigan, M.-H. Lu, and J. C. Sturm, “Improvement of output coupling efficiency of organic light-emitting diodes by backside substrate modification,” Appl. Phys. Lett.76(13), 1650–1652 (2000). [CrossRef]
  5. T. Yamasaki, K. Sumioka, and T. Tsutsui, “Organic light-emitting device with an ordered monolayer of silica microspheres as a scattering medium,” Appl. Phys. Lett.76(10), 1243–1245 (2000). [CrossRef]
  6. S. Möller and S. R. Forrest, “Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays,” J. Appl. Phys.91(5), 3324–3327 (2002). [CrossRef]
  7. Y. Sun and S. R. Forrest, “Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography,” J. Appl. Phys.100(7), 073106 (2006). [CrossRef]
  8. J. Lim, S. S. Oh, D. Y. Kim, S. H. Cho, I. T. Kim, S. H. Han, H. Takezoe, E. H. Choi, G. S. Cho, Y. H. Seo, S. O. Kang, and B. Park, “Enhanced out-coupling factor of microcavity organic light-emitting devices with irregular microlens array,” Opt. Express14(14), 6564–6571 (2006). [CrossRef] [PubMed]
  9. J. M. Lupton, B. J. Matterson, I. D. W. Samuel, M. J. Jory, and W. L. Barnes, “Bragg scattering from periodically microstructured light emitting diodes,” Appl. Phys. Lett.77(21), 3340–3342 (2000). [CrossRef]
  10. Y.-J. Lee, S.-H. Kim, J. Huh, G.-H. Kim, Y.-H. Lee, S.-H. Cho, Y.-C. Kim, and Y. R. Do, “A high-extraction-efficiency nanopatterned organic light-emitting diode,” Appl. Phys. Lett.82(21), 3779–3781 (2003). [CrossRef]
  11. Y. R. Do, Y.-C. Kim, Y.-W. Song, and Y.-H. Lee, “Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure,” J. Appl. Phys.96(12), 7629–7636 (2004). [CrossRef]
  12. S. Jeon, J.-W. Kang, H.-D. Park, J.-J. Kim, J. R. Youn, J. Shim, J.-H. Jeong, D.-G. Choi, K.-D. Kim, A. O. Altun, S.-H. Kim, and Y.-H. Lee, “Ultraviolet nanoimprinted polymer nanostructure for organic light emitting diode application,” Appl. Phys. Lett.92(22), 223307 (2008). [CrossRef]
  13. A. M. Adawi, R. Kullock, J. L. Turner, C. Vasilev, D. G. Lidzey, A. Tahraoui, P. W. Fry, D. Gibson, E. Smith, C. Foden, M. Roberts, F. Qureshi, and N. Athanassopoulou, “Improving the light extraction efficiency of polymeric light emitting diodes using two-dimensional photonic crystals,” Org. Electron.7(4), 222–228 (2006). [CrossRef]
  14. M. Fujita, T. Ueno, K. Ishihara, T. Asano, S. Noda, H. Ohata, T. Tsuji, H. Nakada, and N. Shimoji, “Reduction of operating voltage in organic light-emitting diode by corrugated photonic crystal structure,” Appl. Phys. Lett.85(23), 5769–5771 (2004). [CrossRef]
  15. K. Ishihara, M. Fujita, I. Matsubara, T. Asano, S. Noda, H. Ohata, A. Hirasawa, H. Nakada, and N. Shimoji, “Organic light-emitting diodes with photonic crystals on glass substrate fabricated by nanoimprint lithography,” Appl. Phys. Lett.90(11), 111114 (2007). [CrossRef]
  16. A. O. Altun, S. Jeon, J. Shim, J.-H. Jeong, D.-G. Choi, K.-D. Kim, J.-H. Choi, S.-W. Lee, E.-S. Lee, H.-D. Park, J. R. Youn, J.-J. Kim, Y.-H. Lee, and J.-W. Kang, “Corrugated organic light emitting diodes for enhanced light extraction,” Org. Electron.11(5), 711–716 (2010). [CrossRef]
  17. J.-H. Jang, M.-C. Oh, T.-H. Yoon, and J. C. Kim, “Polymer grating imbedded organic light emitting diodes with improved out-coupling efficiency,” Appl. Phys. Lett.97(12), 123302 (2010). [CrossRef]
  18. P. A. Hobson, S. Wedge, J. A. E. Wasey, I. Sage, and W. L. Barnes, “Surface plasmon mediated emission from organic light-emitting diodes,” Adv. Mater. (Deerfield Beach Fla.)14(19), 1393–1396 (2002). [CrossRef]
  19. J. Feng, T. Okamoto, and S. Kawata, “Enhancement of electroluminescence through a two-dimensional corrugated metal film by grating-induced surface-plasmon cross coupling,” Opt. Lett.30(17), 2302–2304 (2005). [CrossRef] [PubMed]
  20. J. Meyer, S. Hamwi, T. Bülow, H.-H. Johannes, T. Riedl, and W. Kowalsky, “Highly efficient simplified organic light emitting diodes,” Appl. Phys. Lett.91(11), 113506 (2007). [CrossRef]
  21. J. Li, M. Yahiro, K. Ishida, H. Yamada, and K. Matsushige, “Enhanced performance of organic light emitting device by insertion of conducting/insulating WO3 anodic buffer layer,” Synth. Met.151(2), 141–146 (2005). [CrossRef]
  22. Y. K. Lee, J. R. Oh, and Y. R. Do, “Enhanced extraction efficiency of Y2O3:Eu3+ thin-film phosphors coated with hexagonally close-packed polystyrene nanosphere monolayers,” Appl. Phys. Lett.91(4), 041907 (2007). [CrossRef]
  23. K. Y. Ko, K. N. Lee, Y. K. Lee, and Y. R. Do, “Enhanced light extraction from SrGa2S4:Eu2+ film phosphors coated with various sizes of polystyrene nanosphere monolayers,” J. Phys. Chem. C112(20), 7594–7598 (2008). [CrossRef]

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