Energy transfer processes in Ca3Tb2−xEuxSi3O12 (x=0–2)

Abstract The luminescent properties of Tb 3+ and Eu 3+ have been studied in several silicates having a silico-carnotite-type structure. Fast energy migration among Tb 3+ ions has been found in Ca 3 Tb 2 Si 3 O 12 and Ca 3 Tb 2– x Eu x Si 3 O 12 ( x = 0–0.1). In the case of Ca 3 Tb 2– x Eu x Si 3 O 12 , Tb 3 + –Eu 3+ energy transfer is observed upon excitation in the UV bands of Tb 3+ . The transfer gives rise to strong emission from Eu 3+ in the red spectral region at 612 nm. The efficiency of the transfer at room temperature in Ca 3 Tb 1.9 Eu 0.1 Si 3 O 12 has been evaluated. The temperature evolution of the luminescent properties of Ca 3 Tb 2 Si 3 O 12 and Ca 3 Tb 1.9 Eu 0.1 Si 3 O 12 has been studied at temperatures ranging from 8 to 330 K.