Journal
APPLIED PHYSICS LETTERS
Volume 82, Issue 26, Pages 4651-4653Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1588733
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A spectroscopically resolved delayed electrofluorescence is observed from poly[2-methoxy-5-(2(')-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) thin film at low temperature. From the measurements of the delayed fluorescence intensities at a particular delay time as well as the decay kinetics of the delayed fluorescence spectra at different temperatures, we conclude that the delayed fluorescence is generated via triplet-triplet annihilation. It is suggested that the triplet state of MEH-PPV thin film has a lifetime much shorter than that of polyfluorene thin film, which is consistent with the triplet energies of these polymers. (C) 2003 American Institute of Physics.
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