Efficient polymer light emitting diodes with metal fluoride/Al cathodes

Yang, Xiaohui; Mo, Yueqi; Yang, Wei; Yu, Gang; Cao, Yong
July 2001
Applied Physics Letters;7/30/2001, Vol. 79 Issue 5
Academic Journal
We reported efficient polymer light emitting diodes with alkali and alkaline earth metal fluoride Al cathodes. The quantum efficiencies of these devices are more than two orders of magnitude higher than those in devices without fluoride layer, comparable to the best data reported with similar electroluminescent polymers. The mechanism of the metal fluoride/Al bilayer cathodes was also discussed based on photovoltaic, ac impedance, and photoluminescence efficiency measurement. © 2001 American Institute of Physics.


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