LUMINESCENCE FROM F-TYPE CENTERS IN ELECTRON-IRRADIATED CADMIUM-SULFIDE

A Febetron 706 was used to irradiate a cadmium sulphide crystal at roo m temperature with 3 ns pulses of electrons with energy up 0.60 MeV. T ime resolved emission spectroscopy was used to measure the irradiation induced luminescence spectrum at wavelengths between 200 and 600 nm. A prominent emission band with a maximum at 520 nm was observed. The i rradiation electron energy was varied between 0.50 and 0.60 MeV and th e emission intensity was recorded at 520 nm. A threshold for the onset of luminescence was observed at an electron energy of approximately 0 .51 MeV. The threshold is attributed to sulphide ion displacement resu lting in the production of F+ type centres. The sulphide ion displacem ent energy was calculated to be 53 +/- 1 eV.