Electromodulation studies of a polyfluorene light-emitting diode

Paul A. Lane, Paul J. Brewer, Donal D.C. Bradley, Andrew De Mello, John C. De Mello

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 by 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 trapped electrons at the anode.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Dec 1 2004
Externally publishedYes

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