UV–VUV-excited photoluminescence of RE-activated CaLaP 3O 10 ( RE=Eu,Tb)

Abstract

Monazite-type polyphosphate CaLaP 3O 10 was synthesized by solid-state reaction at 1000 °C and their photoluminescence of Eu 3+ and Tb 3+ in CaLaP 3O 10 under ultraviolet (UV) and vacuum-ultraviolet (VUV) excitation were evaluated for the first time. The emission spectra of CaLaP 3O 10:Eu 3+showed that Eu 3+ are in a site with inversion symmetry because the magnetic dipole transition 5 D 0– 7 F 1 was the strongest both upon 254 and 147 nm excitation. Monitored at 621 nm the excitation spectra consisted of host absorption bands, charge transfer band of Eu–O and the intraconfiguration 4 f 6 transition of Eu 3+. Green phosphor CaLaP 3O 10:Tb 3+exhibited better color purity when excited by 147 nm than that excited by 254 nm. With monitored at 542 nm the host absorption bands of CaLaP 3O 10:Tb 3+ were also observed. Besides the host absorption bands there were strong f– d and weak f– f transitions of Tb 3+.