| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Cathode Formed by Thermal Evaporation of Ba:Al Alloy and Estimations of Barrier Height in an Organic LED |
| DING Lei1**, ZHANG Fang-Hui1,2
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1School of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi'an 710021
2Shaanxi Panel Display Engineering Center, Xi'an 710021
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| Cite this article: |
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DING Lei, ZHANG Fang-Hui 2011 Chin. Phys. Lett. 28 067801 |
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Abstract It is demonstrated that barium and aluminum alloy synthesized by melting in a glass tube under low vacuum is applicable for organic laser emitting diodes (LEDs) as a thin film cathode. The alloy film obtained by the thermal evaporation of pre-synthesized alloy is used in a single-boat organic LED device with the structure: indium tin oxide (ITO)/4,4'-bis[N−(1-naphthyl)-N−phenylamino]biphenyl(NPB)/tris-(8-hydroxyquinoline) aluminum(Alq3)/barium:aluminum alloy. The experimental results show that devices with this alloy film cathode exhibit better current density-voltage-luminance characteristics than those with a conventional pure Al cathode, and more weight of barium in aluminum leads to better performance of the devices. Characteristics of current density versus voltage for the electron-only devices are fitted by the Richardson–Schottky emission model, indicating that the electron injection barrier has a decrease of about 0.3 eV by this alloy cathode.
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| Keywords:
78.30.Fs
78.30.Jw
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Received: 12 April 2011
Published: 29 May 2011
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| PACS: |
78.30.Fs
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(III-V and II-VI semiconductors)
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78.30.Jw
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(Organic compounds, polymers)
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[1] Shaheen S E, Jabbour G E, Morrell M M, Kawabe Y and Kippelen B 1998 J. Appl. Phys. 84 2324
[2] Zhang X H, Liu M W, Wong O Y, Lee C S, Kwong H L, Lee S T and Wu S K 2003 Chem. Phys. Lett. 369 478
[3] Chen S Y, Chu T Y and Chen J F 2006 Appl. Phys. Lett. 89 053518
[4] Zhang D Q, Li Y, Zhang G H, Gao Y D, Duan L, Wang L D and Yong Q 2008 Appl. Phys. Lett. 92 073301
[5] Luo J X, Xiao L X, Chen Z J and Gong Q H 2008 Appl. Phys. Lett. 93 133301
[6] Tang C W, Vanslyke S A and Chen C H 1989 J. Appl. Phys. 65 3610
[7] Naka S, Tamekawa M, Terashita T, Okada H, Anada H and Onnagawa H 1997 Synth. Met. 91 129
[8] Han K, Yi Y J, Song W J, Cho S W, Lee P E, Jeon H, Whang C N and Jeong K 2008 Org. Electron. 9 30
[9] Wu I W, Chen Y H, Wang P S, Wang C G, Hsu S H and Wu C I 2010 Appl. Phys. Lett. 96 013301
[10] Gu G, Bulovic V, Burrows P E and Forrest S R 1996 Appl. Phys, Lett. 68 2606
[11] Jiang X Y, Zhang Z L, Zheng X Y, Wu Y Z and Xu S H 2001 Thin Solid film. 401 251
[12] Jiang X Y, Zhang Z L, Zhang B X, Zhu W Q and Shao H X 2002 Synth. Met. 129 9
[13] Lim J T, Yeom G Y, Lhm K, and Kang T H 2009 J. Appl. Phys. 105 083705
[14] You Z Z and Hua G J 2009 Vacuum. 83 984
[15] Li Y, Mason M G, Tang C W and Gao Y L 2001 Appl. Surf. Sci. 175–176 412
[16] Barth S, Wolf U and Bässler H 1999 Phys. Rev. B 60 8791
[17] Mori T, Fujikawa H, Tokito S and Taga Y 1998 Appl. Phys. Lett. 73 2763
[18] Lim J T, Lee J H, Park J K, Park B J and Yeom G Y 2008 Surf. Coat. Technol. 202 5646
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