The effect of implantation O-doping up to the limit of solubility was investigated. An analysis of reflectivity and cathodoluminescence spectra suggested that interstitial O was responsible for the red emission of the sulfide, while O acceptor centers in the lattice sites were responsible for orange emissions. The implantation of large amounts of O gave rise to additional absorption and to a band for the bound exciton.

N.K.Morozova, A.V.Morozov, V.G.Galstyan, I.A.Karetnikov, L.D.Nazarova, I.I.Razgulyaev: Neorganicheskie Materialy, 1994, 30[6], 731-6 (Inorganic Materials, 1994, 30[6], 683-7)