ABSTRACT
Powder phosphors, excitation and emission spectra of Sn, Sb, T1, Pb, and Bi ions introduced into various oxygen-dominated host lattices have been reported though the analyses of these spectra have not yet been completed due to structureless broad-band spectra and unknown site symmetries. In some cases, temperature-dependent structure is observed in this band, but it is not precisely studied because of the small intensity of this band. In oxygen-dominated host lattices, the emissions from Sn, Sb, T1, Pb, and Bi are reported. Triplet structure is explained as a result of the splitting of the excited states due to the interaction with lattice vibrations, that is, due to the dynamical Jahn-Teller effect. The luminescence decay is not very fast and of the order of microseconds. This is because the luminescence transition is spin-forbidden.
