Identification of cathodoluminescence centres in erbium-implanted zinc selenide

Abstract
Detailed study of the cathodoluminescence emission spectra of 166Er+-implanted zinc selenide cubic single crystals as functions of the post-implantation isochronal annealing temperature has allowed three luminescence centres to be identified. Centre A consists of an Er3+ ion at a zinc interstitial site surrounded by four nearest-neighbour (NN) Zn2+ ions and six next-nearest-neighbour (NNN) Se2+ ions. The other two centres each have a rare-earth ion at a substitutional site, centre B when an Er3+ ion occupies a selenium substitutional site surrounded by four NN Zn2+ ions and twelve NNN Se2- ions and centre C when an Er3+ ion occupies a zinc substitutional site surrounded by four NN Se2- ions and twelve NNN Zn2+ ions.