Radioactive isotope identifications of Au and Pt photoluminescence centresin silicon

Photoluminescence (PL) measurements on silicon samples implanted with radio active Hg isotopes which decay fully or partly through the series Au/Pt/Ir are reported. Results obtained with Au-193 isotopes (half-life 17 h) confir m earlier work concerning the involvement of Au in the 735 meV centre first observed in Fe-diffused silicon. A PL spectrum consisting of a series of d oublets originating at 780/782 meV is found to be Au-related. An important new result is that the 1066 meV trigonal centre, commonly attributed to Fe- B pairs, is found to involve Au atoms. For Pt-related Pt-191 isotopes (half -life 2.9 days) provide conclusive proof of PI involvement in three PL cent res, centres with zero-phonon lines at 1026, 884 and 777 meV. There is not sufficient evidence from the changes observed in the spectra to make any co nclusive deductions concerning the occurrence of Ir-related PL spectra in o ur samples.