Energy transfer in mercury-doped calcium tungstate and molybdate

Abstract

The luminescence of CaWO4---Hg and CaMoO4---Hg is reported. The presence of Hg2+ ions in the CaWO4 lattice influences the luminescence of pure CaWO4 drastically due to efficient energy transfer from host lattice groups to the emitting centre consisting of a tungstate group with a neighbouring mercuric ion. The luminescence characteristics of CaMoO4---Hg do not differ strongly from those of pure CaMoO4 due to the absence of efficient energy transfer.