Efficient fatigue of excimer fluorescence by an electric field and generation of electroluminescence of 1,3-bis-(1-pyrenyl)propane in a PMMA polymer film

Excimer fluorescence of 1,3-bis-(1-pyrenyl)propane (Py-Py) doped in a PMMA polymer film with a peak at ∼470 nm is quenched by an external electric field extremely well. It is suggested that a field-assisted charge separation of Py-Py followed by efficient charge transports occurs only in the excimer with a sandwich-type configuration. The electroluminescence spectrum which is similar to the excimer fluorescence is generated at high fields without photoirradiation, probably by a radiative recombination of the hole–electron pair through a short methylene chain. A good correlation is found between the efficient fatigue of the excimer fluorescence and the generation of the electroluminescence.