UV-VUV-excited photoluminescence of RE-activated CaLaP3O10 (RE=Eu,Tb) |
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Authors: | Chunfang Wu Wenjing Liu |
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Affiliation: | Department of Materials Science, Institute of Functional and Environmental Materials, School of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730000, PR China |
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Abstract: | Monazite-type polyphosphate CaLaP3O10 was synthesized by solid-state reaction at 1000 °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 5D0-7F1 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 4f6 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+. |
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Keywords: | 78.55.&minus m |
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