Transient Properties of the Luminescence of Eu3+ and Tb3+ in Oxysulfide Matrices

摘要: Transient properties of Eu/sup 3 +/ emitting levels /sup 5/D/sub 2/, 1/, and 0/ in an yttrium oxysulfide matrix have been studied at various activator concentrations under different excitation modes. was excited either to the charge-transfer state (CTS) by UV light or selectively 1/ laser. At low concentrations, results can be explained a step process, 2/ ..-->.. 0/; values calculated from rate equations are agreement with measured ones. The decrease lifetimes increasing concentration cross-relaxation process between 1 -/ ions. lifetime level decreases linearly when CTS cathode rays; selective excitation, is constant. quenching seems more complex than energy transfer sink possibly connected presence ions into CTS, caused electronic structure ofmore » (YO)/sub 2/S. In Tb/sup -activated oxysulfides, no 3/ 4/ observed. (GdO),S:Tb/sup compounds contained as impurity, effective -/(/sup 4/) + 7/F/sub 0/) +/(/sup 7/F/sup noticed.« less