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Effect of Phosphorescent Sensitizer on White Organic Light-Emitting Devices |
| CHENG Gang1;QIU Song2;ZHAO Yi1;MA Yu-Guang2;LIU Shi-Yong1 |
| 1National Laboratory of Integrated Optoelectronics, Jilin University, Changchun 130023
2Key Laboratory of Superamolecular Structure and Material, Jilin University, Changchun 130023 |
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| Cite this article: |
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CHENG Gang, QIU Song, ZHAO Yi et al 2003 Chin. Phys. Lett. 20 1607-1609 |
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Abstract We have fabricated high-efficiency white organic light-emitting devices by using the phosphorescent material fac tris (2-phenylpyridine) iridium [Ir(ppy3)] as a sensitizer. Ir(ppy)3 and the fluorescent dye 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9 enyl) (DCJTB) are co-doped into 4,4'-N,N'-dicarbazole-biphenyl (CBP) host. N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-biphenyl)-4,4'-diamine (NPB) acts as a blue light-emitting as well as hole-transporting layer. The chromaticity of white emission can be tuned by adjusting the concentration of Ir(ppy)3 and DCJTB. The maximum efficiency and luminance of the device with 3-wt.% Ir(ppy)3 and 2-wt.% DCJTB are 7.5 cd A-1 and 12020 cd m-2, respectively, which produces fairly pure white emission with the commission international De L'Eclairage coordinates of (0.33, 0.32) at 10 V.
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| Keywords:
78.60.Fi
78.66.Qn
85.60.Jb
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Published: 01 September 2003
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