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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24411–24417

High efficiency blue phosphorescent organic light-emitting diodes with a multiple quantum well structure for reduced efficiency roll-off

Xiao Yang, Shaoqing Zhuang, Xianfeng Qiao, Guangyuan Mu, Lei Wang, Jiangshan Chen, and Dongge Ma  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24411-24417 (2012)

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Highly efficient blue phosphorescent organic light-emitting diodes (PhOLEDs) with a multiple quantum well (MQW) structure were investigated. A peak external quantum efficiency (EQE) of 20.31%, current efficiency of 40.31 cd/A and power efficiency of 30.14 lm/W were achieved in the optimized device with two quantum wells (QWs). The obtained efficiencies are much higher than those of the control devices without QWs. More importantly, the MQW devices exhibit low efficiency roll-off. At a high luminance of 5000 cd/m2, the EQE still keeps at a high value of 18.86% in the optimized MQW device, and the efficiency roll-off is only 7.14%, which is lower than that of 30.78% in the control device (reduced from 16.05% to 11.11%). Meanwhile, the maximum power efficiency of the optimized MQW device was also exhibited more than 54.80% improvement compared to the control device. The high efficiency and low efficiency roll-off are attributed to the effective confinement of charge carriers and excitons by the state-of-the-art MQWs.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.4170) Optical devices : Multilayers
(310.1860) Thin films : Deposition and fabrication

ToC Category:
Optical Devices

Original Manuscript: September 4, 2012
Revised Manuscript: October 6, 2012
Manuscript Accepted: October 8, 2012
Published: October 11, 2012

Xiao Yang, Shaoqing Zhuang, Xianfeng Qiao, Guangyuan Mu, Lei Wang, Jiangshan Chen, and Dongge Ma, "High efficiency blue phosphorescent organic light-emitting diodes with a multiple quantum well structure for reduced efficiency roll-off," Opt. Express 20, 24411-24417 (2012)

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  1. C. W. Tang and S. A. VanSlyke, “Organic electroluminescent diodes,” Appl. Phys. Lett.51(12), 913–915 (1987). [CrossRef]
  2. R. H. Friend, R. W. Gymer, A. B. Holmes, J. H. Burroughes, R. N. Marks, C. Taliani, D. D. C. Bradley, M. Lo, W. R. Salaneck, D. A. Dos Santos, and J. L. Bredas, “Electroluminescence in conjugated polymers,” Nature397(6715), 121–128 (1999). [CrossRef]
  3. Z. Shen, P. E. Burrows, V. Bulovic´, S. R. Forrest, and M. E. Thompson, “Three-Color, Tunable, Organic Light-Emitting Devices,” Science276(5321), 2009–2011 (1997). [CrossRef]
  4. B. W. D'Andrade and S. R. Forrest, “White Organic Light-Emitting Devices for Solid-State Lighting,” Adv. Mater. (Deerfield Beach Fla.)16(18), 1585–1595 (2004). [CrossRef]
  5. A. Chaskar, H. F. Chen, and K. T. Wong, “Bipolar host materials: a chemical approach for highly efficient electrophosphorescent devices,” Adv. Mater. (Deerfield Beach Fla.)23(34), 3876–3895 (2011). [CrossRef] [PubMed]
  6. S. Gong, Y. Chen, J. Luo, C. Yang, C. Zhong, J. Qin, and D. Ma, “Bipolar Tetraarylsilanes as Universal Hosts for Blue, Green, Orange, and White Electrophosphorescence with High Efficiency and Low Efficiency Roll-Off,” Adv. Funct. Mater.21(6), 1168–1178 (2011). [CrossRef]
  7. H. H. Chou and C. H. Cheng, “A highly efficient universal bipolar host for blue, green, and red phosphorescent OLEDs,” Adv. Mater. (Deerfield Beach Fla.)22(22), 2468–2471 (2010). [CrossRef] [PubMed]
  8. L. Duan, D. Zhang, Y. Li, G. Zhang, and Y. Qiu, “Improving the performance of OLEDs by using a low-temperature-evaporable n-dopant and a high-mobility electron transport host,” Opt. Express19(S6Suppl 6), A1265–A1271 (2011). [CrossRef] [PubMed]
  9. J. Lee, J. I. Lee, J. Y. Lee, and H. Y. Chu, “Improved performance of blue phosphorescent organic light-emitting diodes with a mixed host system,” Appl. Phys. Lett.95(25), 253304 (2009). [CrossRef]
  10. J. S. Swensen, E. Polikarpov, A. V. Ruden, L. Wang, L. S. Sapochak, and A. B. Padmaperuma, “Improved Efficiency in Blue Phosphorescent Organic Light-Emitting Devices Using Host Materials of Lower Triplet Energy than the Phosphorescent Blue Emitter,” Adv. Funct. Mater.21(17), 3250–3258 (2011). [CrossRef]
  11. K. S. Yook and J. Y. Lee, “Solution processed high efficiency blue and white phosphorescent organic light-emitting diodes using a high triplet energy exciton blocking layer,” Org. Electron.12(8), 1293–1297 (2011). [CrossRef]
  12. Q. Wang, J. Ding, D. Ma, Y. Cheng, L. Wang, X. Jing, and F. Wang, “Harvesting Excitons Via Two Parallel Channels for Efficient White Organic LEDs with Nearly 100% Internal Quantum Efficiency: Fabrication and Emission-Mechanism Analysis,” Adv. Funct. Mater.19(1), 84–95 (2009). [CrossRef]
  13. T. H. Wu, J. P. Wu, and Y. J. Chiu, “Field-driven all-optical wavelength converter using novel InGaAsP/InAlGaAs quantum wells,” Opt. Express19(27), 26645–26650 (2011). [CrossRef] [PubMed]
  14. M. Ortolani, D. Stehr, M. Wagner, M. Helm, G. Pizzi, M. Virgilio, G. Grosso, G. Capellini, and M. De Seta, “Long intersubband relaxation times in n-type germanium quantum wells,” Appl. Phys. Lett.99(20), 201101 (2011). [CrossRef]
  15. A. Vardi, S. Sakr, J. Mangeney, P. K. Kandaswamy, E. Monroy, M. Tchernycheva, S. E. Schacham, F. H. Julien, and G. Bahir, “Femto-second electron transit time characterization in GaN/AlGaN quantum cascade detector at 1.5 micron,” Appl. Phys. Lett.99(20), 202111 (2011). [CrossRef]
  16. P. Chaisakul, D. Marris-Morini, G. Isella, D. Chrastina, N. Izard, X. L. Roux, S. Edmond, J. R. Coudevylle, and L. Vivien, “Room temperature direct gap electroluminescence from Ge/Si0.15Ge0.85 multiple quantum well waveguide,” Appl. Phys. Lett.99(14), 141106 (2011). [CrossRef]
  17. L. Schade, U. T. Schwarz, T. Wernicke, J. Rass, S. Ploch, M. Weyers, and M. Kneissl, “On the optical polarization properties of semipolar InGaN quantum wells,” Appl. Phys. Lett.99(5), 051103 (2011). [CrossRef]
  18. Y. Qiu, Y. Gao, L. Wang, P. Wei, L. Duan, D. Zhang, and G. Dong, “High-efficiency organic light-emitting diodes with tunable light emission by using aromatic diamine/5,6,11,12-tetraphenylnaphthacene multiple quantum wells,” Appl. Phys. Lett.81(19), 3540–3542 (2002). [CrossRef]
  19. Y. Qiu, Y. Gao, P. Wei, and L. Wang, “Organic light-emitting diodes with improved hole-electron balance by using copper phthalocyanine/aromatic diamine multiple quantum wells,” Appl. Phys. Lett.80(15), 2628–2630 (2002). [CrossRef]
  20. J. Huang, K. Yang, S. Liu, and H. Jiang, “High-brightness organic double-quantum-well electroluminescent devices,” Appl. Phys. Lett.77(12), 1750–1752 (2000). [CrossRef]
  21. S. H. Kim, J. Jang, J. M. Hong, and J. Y. Lee, “High efficiency phosphorescent organic light emitting diodes using triplet quantum well structure,” Appl. Phys. Lett.90(17), 173501 (2007). [CrossRef]
  22. K. S. Yook, S. E. Jang, S. O. Jeon, and J. Y. Lee, “Fabrication and Efficiency Improvement of Soluble Blue Phosphorescent Organic Light-Emitting Diodes Using a Multilayer Structure Based on an Alcohol-Soluble Blue Phosphorescent Emitting Layer,” Adv. Mater. (Deerfield Beach Fla.)22(40), 4479–4483 (2010). [CrossRef] [PubMed]
  23. G. G. Malliaras and J. C. Scott, “The roles of injection and mobility in organic light emitting diodes,” J. Appl. Phys.83(10), 5399–5403 (1998). [CrossRef]
  24. B. C. Hen and C. S. Lee, EeS. T. Lee, E. E. P. Webb, Y. C. Chan, W. Gambling, H. Tian, and W. Zhu, “Improved Time-of-Flight Technique for Measuring Carrier Mobility in Thin Films of Organic Electroluminescent Materials Time (µ s),” Jpn. J. Appl. Phys.39, 1190–1192 (2000).
  25. S. Su, T. Chiba, T. Takeda, and J. Kido, “Pyridine-Containing Triphenylbenzene Derivatives with High Electron Mobility for Highly Efficient Phosphorescent OLEDs,” Adv. Mater. (Deerfield Beach Fla.)20(11), 2125–2130 (2008). [CrossRef]
  26. S. Reineke, K. Walzer, and K. Leo, “Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emitters,” Phys. Rev. B75(12), 125328 (2007). [CrossRef]
  27. C. H. Hsiao, S. W. Liu, C. T. Chen, and J. H. Lee, “Emitting layer thickness dependence of color stability in phosphorescent organic light-emitting devices,” Org. Electron.11(9), 1500–1506 (2010). [CrossRef]
  28. S. J. Lee, J. H. Seo, G. Y. Kim, and Y. K. Kim, “A Study on the Phosphorescent Blue Organic Light-Emitting Diodes Using Various Host Materials,” Mol. Cryst. Liq. Cryst. (Phila. Pa.)507(1), 345–352 (2009). [CrossRef]
  29. Q. Wang, J. Ding, D. Ma, Y. Cheng, and L. Wang, “Highly efficient single-emitting-layer white organic light-emitting diodes with reduced efficiency roll-off,” Appl. Phys. Lett.94(10), 103503 (2009). [CrossRef]
  30. R. J. Holmes, S. R. Forrest, Y. J. Tung, R. C. Kwong, J. J. Brown, S. Garon, and M. E. Thompson, “Blue organic electrophosphorescence using exothermic host–guest energy transfer,” Appl. Phys. Lett.82(15), 2422–2424 (2003). [CrossRef]

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