2 February 2001 Impact of the metal cathode on the performance of polymer light-emitting diodes
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An appropriate choice of the cathode material and the process of cathode deposition is a key issue in the development of polymer light emitting devices. In this paper, we report on the impact of low work function metals on the luminescence efficiency of thin films of polyfluorene type polymers. Photoluminescence as well as electroluminescence experiments are presented, and in both cases, a strong correlation between the metal layer thickness and the luminescence efficiency is demonstrated. By means of time-of-flight secondary ion mass spectroscopy (TOF-SIMS), the distribution of the metal contamination within the polymer layers is determined. The results strongly suggest that impurity quenching of excitons by metal atoms inside the polymer layer takes place and strongly affects luminescence and device efficiency.
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Matthias Stoessel, Matthias Stoessel, Georg Wittmann, Georg Wittmann, Karsten Heuser, Karsten Heuser, Joerg Blaessing, Joerg Blaessing, Jan Birnstock, Jan Birnstock, W. Rogler, W. Rogler, W. Roth, W. Roth, A. Winnacker, A. Winnacker, Michael Inbasekaran, Michael Inbasekaran, Mark T. Bernius, Mark T. Bernius, Weishi W. Wu, Weishi W. Wu, James J. O'Brien, James J. O'Brien, } "Impact of the metal cathode on the performance of polymer light-emitting diodes", Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); doi: 10.1117/12.416880; https://doi.org/10.1117/12.416880

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