Organic Light-Emitting Diodes with Varying Thickness of Bathocuproine Layer


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A series of organic light-emitting diodes (OLEDs) with or without a bathocuproine (BCP) layer inserted in the control device indium-tin-oxide (ITO)\ N,N'-bis-(1-naphthl)-diphenyl-1,1'- biphenyl-4,4'-diamine (NPB)\ tris(8-quinolinolato) aluminum (Alq)\LiF\Al have been fabricated and measured. Different influences of the BCP layer on electroluminescence (EL) of the OLEDs have been investigated. It is found that the highest efficiency of the OLED with a 1-nm BCP layer inserted between NPB and Alq increases to 3.99 cd/A, ~48% higher than that of the control device, while the EL efficiencies of the devices with other structures are similar to the latter. This phenomenon is ascribed to the hole-blocking effect of the BCP layer and the resulting higher density of carriers in the emission zone of the OLED. The EL performances of the OLEDs with different thicknesses of BCP layer are also discussed in details.



Edited by:

Ran Chen




G. Y. Zhong et al., "Organic Light-Emitting Diodes with Varying Thickness of Bathocuproine Layer", Materials Science Forum, Vol. 694, pp. 901-907, 2011

Online since:

July 2011




[1] C. W. Tang and S. A. VanSlyke, Appl. Phys. Lett. 51, 913 (1987).

[2] S. T. Zhang, X. M. Ding, J. M. Zhao, H. Z. Shi, J. He, Z. H. Xiong, H. J. Ding, E. G. Obbard, Y. Q. Zhan, W. Huang, and X. Y. Hou, Appl. Phys. Lett. 84, 425 (2004).

[3] Y. J. Xia, J. Lin, C. Tang, K. Yin, G. Y. Zhong, G. Ni, B. Peng, F. X. Gan, and W. Huang, J. Phys. D, 39, 4987 (2006).

[4] L. S. Hung, C. W. Tang, and M. G. Mason, Appl. Phys. Lett. 70, 152 (1997).

[5] Z. B. Deng, X. M Ding, S. T. Lee, and W. A. Gambling, Appl. Phys. Lett. 74, 2227 (1999).

[6] J. H. Wu, L. P. Ma, and Y. Yang, Phys. Rev. Lett. 69, 115321 (2004).

[7] W. Tang, H. Z. Shi, G. Xu, B. S. Ong, Z. D. Popovic, J. C. Deng, J. Zhao, and G. H. Rao, Adv. Mater, 17, 2307 (2005).

[8] L. D. Bozano, B. W. Kean, V. R. Deline, J. R. Salem, and J. C. Scott,Appl. Phys. Lett. 84, 607 (2004).

[9] A. K. Mahapatro, R. Agrawal, and S. Ghosh, J. Appl. Phys. 96, 3583 (2004).

[10] J. S. Chen and D. G. Ma, Appl. Phys. Lett. 87, 23505 (2005).

[11] L. P. Ma, J. Liu, and Y. Yang,Appl. Phys. Lett. 80, 2997 (2002).

[12] Z. Y. Xie, L. S. Hung, and S. T. Lee,Appl. Phys. Lett. 79, 1048 (2001).

[13] S. Naka, H. Okada, H. Onnagawa, Y. Yamaguchi, and T. Tsutsui, Syn. Met. 111–112, 331 (2000).

[14] G. Y. Zhong, D. E. Kim, O. K. Kwon, Y. K. Jang, H. K. Shin, and Y. S. Kwon, J. Appl. Phys., 101, 054507 (2007).

[15] G. Y. Zhong, J. He, S. T. Zhang, Z. Xu, Z. H. Xiong, H. Z. Shi, X. M. Ding, W. Huang, and X. Y. Hou, Appl. Phys. Lett. 80, 4846 (2002).

[16] C. J. Huang, C. C. Kang, T. C. Lee, W. R. Chen, T .H. Meen, Journal of Luminescence, 129, 1292 (2009).

[17] S. H. Yang, B. C. Hong, and S. F. Huang, Journal of The Electrochemical Society, 156, J41 (2009).

[18] R. Tomova, P. Petrova, and R. S. Topalova, Phys. Status Solidi C 7, No. 3–4, 992 (2010).