The use of alkali metal compound/Al bilayer cathodes of LiF/Al and Liq/Al caused a dramatic luminous efficiency change of one order of magnitude in organic light-emitting diodes (OLEDs) comprising 2-methyl-9,10-bis(naphthalene-2-yl)anthracene (MADN) as an electron-transporting layer (ETL). In contrast, the use of the same two electrodes yielded similar efficiency in OLEDs comprising of tris(8-hydroxyquinoline) aluminum(III) as an ETL. The dramatic change is attributed to different behaviors of LiF/Al and Liq/Al cathodes toward the ETL. It is revealed that organic alkali metal complex/Al, such as Liq/Al, is superior to inorganic alkali metal compound/Al, such as LiF/Al, as a standard bilayer cathode to investigate the effectiveness of electron-transporting materials for high-efficiency OLEDs.
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29 November 2010
Research Article|
November 30 2010
Efficiency dependence on alkali metal compound/Al bilayer cathode in organic light-emitting diodes
D. Y. Zhou;
D. Y. Zhou
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou 215123, People's Republic of China
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S. D. Cai;
S. D. Cai
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou 215123, People's Republic of China
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W. Gu;
W. Gu
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou 215123, People's Republic of China
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L. S. Liao;
L. S. Liao
a)
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM),
Soochow University
, Suzhou 215123, People's Republic of China
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S. T. Lee
S. T. Lee
2Center of Super-Diamond and Advanced Films (COSDAF),
City University of Hong Kong
, Hong Kong
and Department of Physics and Materials Science, City University of Hong Kong
, Hong Kong
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
Appl. Phys. Lett. 97, 223302 (2010)
Article history
Received:
September 23 2010
Accepted:
November 09 2010
Citation
D. Y. Zhou, S. D. Cai, W. Gu, L. S. Liao, S. T. Lee; Efficiency dependence on alkali metal compound/Al bilayer cathode in organic light-emitting diodes. Appl. Phys. Lett. 29 November 2010; 97 (22): 223302. https://doi.org/10.1063/1.3522883
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