SrGa2S4: RE phosphors for full colour electroluminescent displays

Ternary thiogallate sulphides doped with rare-earth ions fulfill the electrical and optical requirements for thin film electroluminescent phosphors. These materials represent a breakthrough in the achievement of full colour EL displays. SrGa2S4 provides a deep blue emission when doped with Ce3+ and a saturated green with Eu2+. Some luminescent properties of Ce3+ and Eu2+ in SrGa2S4 compounds are reviewed and the various techniques used to prepare thin films of this ternary compound are presented. The behaviour and performances of EL devices are discussed. (orig.)