VUV-UV excited luminescent properties of calcium borophosphate doped with rare earth ions

Abstract

The VUV-UV spectra of rare earth ions activated calcium borophosphate, CaBPO 5:RE (RE=Ce 3+, Sm 3+, Eu 2+, Eu 3+, Tb 3+ and Dy 3+) were determined. The bands at about 155 nm in the VUV excitation spectra are attributed to the host lattice absorptions. The bands at 166 and 190 nm for the sample CaBPO 5:Sm have been considered as related to the f–d transition and the charge transfer band (CTB) of Sm 3+ ions, and the band at 169 nm for the sample CaBPO 5:Dy is assumed to be connected with the f–d transition of the Dy 3+ ions in CaBPO 5. The partial reduction of Eu 3+ CaBPO 5:Eu prepared by high temperature solid state reaction in air is confirmed by the VUV-UV spectra.