Tunable luminescence and temperature sensing behavior of Tb~(3+)/Eu~(3+) co-doped borate glasses

摘要

The luminescent borate glasses co-doped Tb~(3+)/Eu~(3+) were successfully synthesized by conventional melting quenching technique. Under 378 nm UV-light excitation, the 542 nm emission intensity of Tb~(3+) weakened gradually and a shorter decay time was found with increasing the content of Eu~(3+) concentration, confirming the occurrence of Tb~(3+) to Eu~(3+) energy transfer. The luminescent color tunable from pure green to yellow and finally to orange was observed in the Tb~(3+)/Eu~(3+) co-doped borate glasses. The fluorescence intensity ratio between the 542 nm of Tb~(3+): ~5D_4 → ~7F_5 transition and 702 nm of Eu~(3+): ~5D_0 → ~7F_4 transition in the luminescent glass was found to be highly temperature-dependent with a good sensitivity of 0.357 % K~(-1). Such Tb~(3+)/Eu~(3+) co-doped borate glasses may present potential application in solid-state lighting and optical temperature sensors.