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.
Efficiency dependence on alkali metal compound/Al bilayer cathode in organic light-emitting diodes
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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