Modelling of interference effects in anisotropic conjugated polymer devices

In this paper, Re study the effect of optical interference on the emission from conjugated polymer devices. We extend the current models to include th e effects of birefringence in the polymer layers. We also include the effec t of the variation of radiative and nan-radiative rate with position on the quantum efficiency of emission of an excited state. We then model the over all angular distribution, spectrum and efficiency of emission from a device structure. Experimental measurements of photoluminescence emission from PP V light-emitting diode structures are obtained. Comparison between the expe rimental and calculated angular distribution of emission is made, and good agreement is found. This demonstrates the importance of birefringence in de termining the emission from polymer devices. We also demonstrate how to use the interference model to deduce the position of the recombination zone in electroluminescent devices. (C) 2000 Elsevier Science S.A. All rights rese rved.