TRANSIENT ELECTROLUMINESCENCE - MOBILITY AND RESPONSE-TIME IN QUINQUETHIOPHENE LANGMUIR-BLODGETT-FILMS

Transient characteristics of organic light-emitting diodes with Langmu ir-Blodgett films of quinquethiophene as the emitting material have be en studied. Field and thickness dependence of the response time have b een studied. From the time lag between the voltage pulse and the first appearance of electroluminescence emission, the mobility parallel to the chain of the molecules has been calculated. In thicker films, anis otropy in mobility has been observed when compared with previous resul ts obtained from field-effect studies. The interfaces have been found to play an important role in thinner films. (C) 1997 American Institut e of Physics.