UV-VUV-excited photoluminescence of RE-activated CaLaP3O10 (RE = Eu,Tb)

摘要

Monazite-type polyphosphate CaLaP3O10 was synthesized by solid-state reaction at 1000 degrees C and their photoluminescence of EU3+ and Tb3+ in CaLaP3O10 under ultraviolet (UV) and vacuum- ultraviolet (VUV) excitation were evaluated for the first time. The emission spectra of CaLaP3O10:Eu3+ showed that Eu3+ are in a site with inversion symmetry because the magnetic dipole transition D-5(0)-F-7(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 4f(6) transition of Eu3+. Green phosphor CaLaP3O10:Tb3+ 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 CaLaP3O10:Tb3+ were also observed. Besides the host absorption bands there were strong f-d and weak f-f transitions of Tb3+. (c) 2006 Elsevier Inc. All rights reserved.