BLUE-LIGHT ELECTROLUMINESCENCE FROM P-PHENYLENE VINYLENE-BASED COPOLYMERS

Electroluminescence (EL) in the blue region of the spectrum with a max imum at 465 nm was observed from polymer films sandwiched between indi um-tin-oxide and Al electrodes. The specially designed soluble multibl ock copolymers used consisted of chromophoric units that have uniform conjugation length and are spaced with polymethylene units of various lengths. EL originates from the radiative decay of the chromophore sin glet excitation created as a result of the recombination of injected c harge carriers.