Various colour electroluminescence of rare-earth-implanted ZnS diodes

Single-crystal zinc sulphide has been implanted with one or two rare-earth elements and used to fabricate light-emitting diodes. The dependence of electroluminescence brightness on current, temperature and implantation fluence has been studied, and cathodoluminescence and electroluminescence emission spectra have been measured. Different relative proportions of two implanted rare-earth elements in a double implantation have been used to obtain different colours of electroluminescence emission.