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The electrical characteristics of PPV based light emitting diodes were studied as a function of their working time. The degradation of the diodes was observed through a decrease of the current density together with an increase of the turn on voltage. Analysis of the J-F characteristics showed that the conduction mechanism in the diodes did not change but the decrease in the light emission was essentially...
The electrical properties of 4,4′-bis(4-styryl-styryl) benzene oligomer based diodes were investigated by d.c and a.c measurements. At high field, the charge carriers are injected through potential barriers at the interface and the transport occurs via a field assisted thermal ionization process in the bulk of the oligomer. The influence of the metal electrode revealed in the current-voltage characteristics...
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