Isotopic fingerprints of Pt-containing luminescence centers in highly enrichedS28i

Recently we have shown that the reduction in the photoluminescence linewidth of many deep luminescence centers in highly enriched $^{28}\text{S}\text{i}$ results in well-resolved isotopic fingerprints. This allows for a better characterization of a defect center, as not only the involvement of a specific element but also the number of atoms of that element within the complex can be determined. Surprisingly, we have found that many well-known luminescence centers have a different composition than originally supposed. In addition, we have found a large number of four- and five-atom luminescence centers involving the elements Cu, Au, and Li. Here we introduce series of four- and five-atom deep luminescence centers involving a single Pt atom together with Cu and Li, similar to what has been seen previously for Au-containing luminescence centers.