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Efficient EL was observed in a new type of electroactive organic-polymer composites based on cyanine dye J- aggregates. Such systems exhibit very narrow EL emission spectra the position of which may be varied within the green-red range by modifying the molecular structure of the dyes.

In aromatic polyimides based on 9,10- bis(aminophenyl)anthracene or 9,10- bis(phenylthio)anthracene, charge carrier transport has been studied by conventional time-of-flight techniques. The electric field and temperature dependencies of both hole and electron drift mobility were observed. In amorphous film of the soluble polyimide, the drift mobility was found to reach the value of 10-4cm2V-1s-1. In film of the insoluble polyimide containing a crystalline phase, the mobility was lower by one or two orders of magnitude. The result is attributed to the presence of cavities in the crystalline film. The applicability of known theoretical models describing the temperature and electric field dependencies of mobility is discussed. It was found out that J-aggregates, formed in the soluble polyimides doped with cyanine dye molecules, play an active role in charge carrier transport in the electroluminescence composites.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.