Mathematical modeling of the light absorption coefficient of electroluminescent layers

Summary form only given. The electroluminophor layers (about 50 micrometers thickness) is the basis of flat light sources with equal surface brightness used in some optical systems as displays and indicators. This paper presents part of the work in developing a method to calculate the ratio of electroluminophors in a mixture which have to be used to prepare a layer, emitting light with a preliminary specified colour. The light, emitted in the layer is partially absorbed in it. In this work the absorption coefficient expressed in terms of Lambert´s law is used as an absorption characteristic. It is calculated by measuring the transmission spectra and thickness for a set of samples prepared with a different ratio between the mixed electroluminophors with blue, green and red emission. The mathematical model of the absorption coefficient dependence on the relative parts of the components in the mixture is obtained and its adequacy has been estimated