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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 1113–1121

Highly transparent organic light-emitting diodes with a metallic top electrode: the dual role of a Cs2CO3 layer

Hyunsu Cho, Jung-Min Choi, and Seunghyup Yoo  »View Author Affiliations


Optics Express, Vol. 19, Issue 2, pp. 1113-1121 (2011)
http://dx.doi.org/10.1364/OE.19.001113


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Abstract

Highly transparent organic light-emitting diodes (TrOLEDs) are demonstrated using damage-free top cathodes of Cs2CO3/ Ag capped with ZnS layers. The presence of ultrathin Cs2CO3 layers not only improves the electron injection properties but also makes Ag thin films more continuous and uniform, resulting in ideal top electrodes with low sheet resistance and high transmittance. The combination of the uniform Ag morphology enabled by Cs2CO3 and the optimized thickness of ZnS capping layers results in TrOLEDs that have a peak transmittance as large as 80% with a luminous transmittance of 76.4%. These TrOLEDs exhibit a low turn-on voltage of 2.6V due to injection improvement by the Cs2CO3 layers.

© 2011 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4170) Optical devices : Multilayers
(310.6860) Thin films : Thin films, optical properties
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Optical Devices

History
Original Manuscript: November 24, 2010
Revised Manuscript: December 23, 2010
Manuscript Accepted: December 23, 2010
Published: January 10, 2011

Virtual Issues
Vol. 6, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Hyunsu Cho, Jung-Min Choi, and Seunghyup Yoo, "Highly transparent organic light-emitting diodes with a metallic top electrode: the dual role of a Cs2CO3 layer," Opt. Express 19, 1113-1121 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-2-1113


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References

  1. G. Gu, V. Bulovic, P. E. Burrows, S. R. Forrest, and M. E. Thompson, “Transparent organic light emitting devices,” Appl. Phys. Lett. 68(19), 2606–2608 (1996). [CrossRef]
  2. G. Parthasarathy, P. E. Burrows, V. Khalfin, V. G. Kozlov, and S. R. Forrest, “A metal-free cathode for organic semiconductor devices,” Appl. Phys. Lett. 72(17), 2138–2140 (1998). [CrossRef]
  3. A. Yamamori, S. Hayashi, T. Koyama, and Y. Taniguchi, “Transparent organic light-emitting diodes using metal acethylacetonate complex as an electron injective buffer layer,” Appl. Phys. Lett. 78(21), 3343–3345 (2001). [CrossRef]
  4. H.-K. Kim, K.-S. Lee, and J. H. Kwon, “Transparent indium zinc oxide top cathode prepared by plasma damage-free sputtering for top-emitting organic light-emitting diodes,” Appl. Phys. Lett. 88(1), 012103 (2006). [CrossRef]
  5. S. Y. Ryu, S. H. Choi, J. T. Kim, C. S. Kim, H. K. Baik, and H. S. Jeong, “Highly efficient transparent organic light-emitting diodes by ion beam assisted deposition-prepared indium tin oxide cathode,” Appl. Phys. Lett. 90(3), 033513 (2007). [CrossRef]
  6. R. B. Pode, C. J. Lee, D. G. Moon, and J. I. Han, “Transparent conducting metal electrode for top emission organic light-emitting devices: Ca-Ag double layer,” Appl. Phys. Lett. 84(23), 4614–4616 (2004). [CrossRef]
  7. Z. Xie, L.-S. Hung, and F. Zhu, “A flexible top-emitting organic light-emitting diode on steel foil,” Chem. Phys. Lett. 381(5-6), 691–696 (2003). [CrossRef]
  8. S. Kim, K. Hong, K. Kim, I. Lee, K.-B. Kim, D. Y. Lee, T.-Y. Kim, and J.-L. Lee, “Hole injection layer of thermally evaporated copper oxide for top emitting organic light emitting diodes,” J. Electrochem. Soc. 157(10), J347–J350 (2010). [CrossRef]
  9. D.-D. Zhang, J. Feng, Y.-Q. Zhong, Y.-F. Liu, H. Wang, Y. Jin, Y. Bai, Q.-D. Chen, and H.-B. Sun, “Efficient top-emitting organic light-emitting devices using Fe3O4 modified Ag anode,” Org. Electron. 11(12), 1891–1895 (2010). [CrossRef]
  10. B. J. Chen, X. W. Sun, and S. C. Tan, “Transparent organic light-emitting devices with LiF/Mg:Ag cathode,” Opt. Express 13(3), 937–941 (2005). [CrossRef] [PubMed]
  11. T. Zhang, L. Zhang, W. Ji, and W. Xie, “Transparent white organic light-emitting devices with a LiF/Yb:Ag cathode,” Opt. Lett. 34(8), 1174–1176 (2009). [CrossRef] [PubMed]
  12. H. Riel, S. Karg, T. Beierlein, B. Ruhstaller, and W. Rieß, “Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling,” Appl. Phys. Lett. 82(3), 466–468 (2003). [CrossRef]
  13. T.-W. Koh, J.-M. Choi, S. Lee, and S. Yoo, “Optical outcoupling enhancement in organic light-emitting diodes: highly conductive polymer as a low-index layer on microstructured ITO electrodes,” Adv. Mater. 22(16), 1849–1853 (2010). [CrossRef] [PubMed]
  14. T. Hasegawa, S. Miura, T. Moriyama, T. Kimura, I. Takaya, Y. Osato, and H. Mizutani, “Novel electron-injection layer for top-emission OLEDs,” SID Int. Symp. Digest Tech. Papers 35(1), 154–157 (2004). [CrossRef]
  15. G. Li, C.-W. Chu, V. Shrotriya, J. Huang, and Y. Yang, “Efficient inverted polymer solar cells,” Appl. Phys. Lett. 88(25), 253503 (2006). [CrossRef]
  16. D. Poitras, C.-C. Kuo, and C. Py, “Design of high-contrast OLEDs with microcavity effect,” Opt. Express 16(11), 8003–8015 (2008). [CrossRef] [PubMed]
  17. X. Liu, X. Cai, J. Qiao, J. Mao, and N. Jiang, “The design of ZnS/ Ag/ ZnS transparent conducive multilayer films,” Thin Solid Films 441(1-2), 200–206 (2003). [CrossRef]
  18. B. P. Rand, P. Peumans, and S. R. Forrest, “Long-range absorption enhancement in organic tandem thin-film solar cells containing silver nanocluster,” J. Appl. Phys. 96(12), 7519–7526 (2004). [CrossRef]
  19. N. Kaiser, “Review of the fundamentals of thin-film growth,” Appl. Opt. 41(16), 3053–3060 (2002). [CrossRef] [PubMed]
  20. H. Cho, C. Yun, and S. Yoo, “Multilayer transparent electrode for organic light-emitting diodes: tuning its optical characteristics,” Opt. Express 18(4), 3404–3414 (2010). [CrossRef] [PubMed]
  21. B. O’Connor, C. Haughn, K.-H. An, K. P. Pipe, and M. Shtein, “Transparent and conductive electrodes based on unpatterned, thin metal films,” Appl. Phys. Lett. 93(22), 223304 (2008). [CrossRef]
  22. S. Chen, Z. Jie, Z. Zhao, G. Cheng, Z. Wu, Y. Zhao, B. Quan, S. Liu, X. Li, and W. Xie, “Improved light outcoupling for top-emitting organic light emitting devices,” Appl. Phys. Lett. 89(4), 043505 (2006). [CrossRef]
  23. H. A. Macleod, Thin-film optical filters (Taylor & Francis, 2001).
  24. J. Meiss, M. K. Riede, and K. Leo, “Optimizing the morphology of metal multilayer films for indium tin oxide(ITO)-free inverted organic solar cells,” J. Appl. Phys. 105(6), 063108 (2009). [CrossRef]
  25. C.-I. Wu, C.-T. Lin, Y.-H. Chen, M.-H. Chen, Y.-J. Lu, and C.-C. Wu, “Electronic structures and electron-injection mechanisms of cesium-carbonate-incorporated cathode structures for organic light-emitting devices,” Appl. Phys. Lett. 88(15), 152104 (2006). [CrossRef]
  26. J. Huang, Z. Xu, and Y. Yang, “Low-work-function surface formed by solution-processed and thermally deposited nanoscale layers of cesium carbonate,” Adv. Funct. Mater. 17(12), 1966–1973 (2007). [CrossRef]
  27. D. Han, H. Kim, S. Lee, M. Seo, and S. Yoo, “Realization of efficient semitransparent organic photovoltaic cells with metallic top electrodes: utilizing the tunable absorption asymmetry,” Opt. Express 18(S4), A513–A521 (2010). [CrossRef] [PubMed]

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