TUNABLE ELECTROLUMINESCENCE AND PHOTOLUMINESCENCE IN PHENYLENEVINYLENE-NAPHTHYLENE-VINYLENE COPOLYMERS

Communication: Color timing of the electro- and photoluminescence from naphthalenevinylene-PPV-based light-emitting diodes between yellow-gr een and red is reported. Band structure considerations are employed to explain that chemical selectivity and selective band-gap tuning are o bserved in some of the copolymers studied but not in others. It is als o found that light emission can be tuned by changing the thickness of the copolymer film in the LED.