LUMINESCENCE OF BISMUTH(III) IN COMPOUNDS WITH LEAD ANTIMONATE (PBSB2O6) STRUCTURE

The luminescence properties of nominally pure and Bi3+-doped compounds with PbSb2O6 structure are reported. If Bi3+ replaces La3+, an emissi on is observed around 500 nm, with an excitation maximum at about 300 nm. If Bi3+ replaces Sr2+, a similar emission is observed in addition to an ultraviolet emission at about 335 nm, These emissions are ascrib ed to a charge-transfer (or D-level) emission and P-3(0,1) --> S-1(0) emission, respectively, The undoped compounds show intrinsic emission from the constituting octahedral groups. In addition, SrSb2O6 shows an extrinsic emission due to Sb3+ on Sr2+ sites. These observations are compared and discussed.