Abstract

CaS: Eu, and CaS: Eu, Sm, luminophors are red-emitting cathodoluminophors. These materials are of great importance due to their high efficiency and chromaticity for electroluminescence and cathodoluminescence display. For the synthesis of luminophors, required amounts of rare earth elements as dopants in high purity grade CaS were employed. For the determination of europium and samarium in the luminophors, a sequential PU 7000 (Philips) inductively coupled plasma atomic emission spectrometer (ICP-AES) was used. The europium emission lines at 381.967 nm and at 412.970 nm and the samarium emission lines at 359.260 nm and at 356.827 nm were compared. The effect of the changes of the forward radio frequency power coupled into the plasma on the emission intensity of various Eu and Sm spectral lines was investigated. The matrix effect due to calcium was studied and a scan of different emission lines of Eu and Sm was carried out. The different samples of cathodoluminophors containing 0.005–0.16 at.% of Eu and 0.02–0.04 at.% of Sm were analysed and the precision (RSD) ranged from 1.1 to 1.6%.