Vuv-Uv-Vis Luminescence, Energy Transfer Dynamics, And Potential Applications Of Ce3+- And Eu2+-Doped Camgsi2o6

Ce3+ and Eu2+ single- and double-doped CaMgSi2O6 phosphors have been prepared by a high-temperature solid-state reaction approach. The VUV-UV-vis luminescence properties are investigated at cryogenic temperatures. The dependencies of luminescence intensity and lifetime on temperature are discussed in detail, and the different thermal-quenching characteristics of luminescence of Ce3+ and Eu2+ in CaMgSi2O6 are revealed combined with the VRBE scheme. Because of the different energy barriers of the lowest 5d energy and the conduction band bottom, luminescence thermal quenching of Ce3+ does not occur below about 505 K, but that of Eu2+ arises at a temperature above similar to 300 K. The energy transfer dynamics is then analyzed by using the Inokuti-Hirayama, Yokota-Tanimoto, and Burshtein. models, respectively. The Ce-3-Eu2+ energy transfer is mainly through the electric dipole-dipole interaction with a critical distance of about 21.2 angstrom, and the energy migration between Ce3+ ions in a fast or slow way is negligible. The different thermal-quenching behaviors of Ce3+ and Eu2+ luminescence and their energy transfer pave the way for the potential applications of the codoped samples in optical thermometry and anticounterfeiting.