Different types of s2 ion luminescence in compounds with eulytite structure

The luminescence properties of Bi4Ge3O12 (BGO)-related compounds are reported. Pb4(PO4)2SO4 shows a similar emission of BGO which is ascribed to an activator-perturbed exciton state or the so-called D-level. Compositions diluted with noble gas cations as well as Pb3Bi(PO4)3 show luminescence of s2 ← sp type on the s2 ion. A search for new scintillator candidates did not appear to be successful but yielded insight into the luminescence of these compounds.