Electric-field screening in polymer light-emitting diodes

Paul A. Lane; John C. De Mello; Robert B. Fletcher; Mark T. Bernius

doi:10.1117/12.521054

16 February 2004 Electric-field screening in polymer light-emitting diodes

Paul A. Lane, John C. De Mello, Robert B. Fletcher, Mark T. Bernius

Proceedings Volume 5214, Organic Light-Emitting Materials and Devices VII; (2004) https://doi.org/10.1117/12.521054
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Electromodulation (EM) spectroscopy has been used to probe the electric field distribution in polymer light-emitting diodes. Below the turn-on bias, the EM spectrum is dominated by electroabsorption of the emissive layer. The electroabsorption signal vanishes at the turn-on bias. Under operation, the EM spectrum is due to excited state absorption from injected charge and bleaching of the ground state absorption of the emissive layer. We conclude that the internal electric field is effectively screened by accumulation of electrons at the anode.

Citation Download Citation

Paul A. Lane, John C. De Mello, Robert B. Fletcher, and Mark T. Bernius "Electric-field screening in polymer light-emitting diodes", Proc. SPIE 5214, Organic Light-Emitting Materials and Devices VII, (16 February 2004); https://doi.org/10.1117/12.521054

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