Abstract
The dependence of light intensities of organic light-emittingdiodes (OLEDs) on the distance of emission zone to metal cathode isinvestigated numerically. The investigation is based on the half-spaceoptical model that accounts for optical interference effects of metalcathode. We find that light intensities of OLEDs are functions of thedistance of emission zone from the metal cathode because of the effectof interference of the metal cathode. This interference leads to anoptimal location of emission zone in OLEDs for the maximum of lightintensities. Optimal locations of emission zone are numerically shownin various emitting colour OLEDs with different metal cathodes andthese results are expected to give insight into the preparation of highefficiency full colour or white light OLEDs.
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