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Environment Optical Properties, Morphology and Long Time Degradation of Alq3 Thin Films

For the first time ever, PL measurements of Alq3 thin films have been performed for as long as six years. The results obtained in this work have confirmed the phenomenological model known as FCM. The FCM means that films of Alq3 are not necessarily amorphous, as commonly described in the literature, but rather they are made up of four morphological aggregations where molecules pack each other in different ways [5], which have nothing to do with the well known crystalline phases [5,6,9]. Moreover, the four components explain plainly the blue shift of the PL band [10,11], and the many effects of annealing processes on the intensity and longevity of Alq3 films [12,13], which have significant consequences also for OLEDs [14]. Ente per le Nuove Tecnologie, l’Energia e l’Ambient