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Title: Observation, identification and characterization of strong self-reduction process in a orthophosphate phosphor CaZr{sub 4}(PO{sub 4}){sub 6}:Eu

Highlights: • CaZr{sub 4}P{sub 4}O{sub 24}:Eu was synthesized by solid state reaction in air. • Relationship between the structure and luminescence properties was discussed. • Strong self-reduction process was found in CaZr{sub 4}P{sub 4}O{sub 24}:Eu prepared in air. • Oxidation states of Eu were identified by muti-method approaches. • The self-reduction mechanism was investigated. - Abstract: CaZr{sub 4}P{sub 4}O{sub 24}:Eu orthophosphate phosphor was synthesized by traditional solid state reaction in air atmosphere. The relationship between the host structure and the characteristic luminescence properties was discussed detailedly. When irradiate the sample under 365 nm UV lamp, intense green emission was observed due to the strong self-reduction process of Eu ions. The oxidation states of Eu ions were identified by muti-method approaches, including photoluminescence spectra, fluorescence lifetimes, Electron spin resonance (ESR) spectroscopy and X-ray photoelectron spectroscopy analysis (XPS). The self-reduction process was controlled by adding the charge compensator Li{sub 2}CO{sub 3} and the self-reduction mechanism was further investigated.
Authors:
;  [1] ; ;  [2] ;  [1]
  1. Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000 (China)
  2. Mitsubishi Chemical Group Science and Technology Research Center, Yokohama 227-8502 (Japan)
Publication Date:
OSTI Identifier:
22345244
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 50; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRON SPIN RESONANCE; FLUORESCENCE; LITHIUM CARBONATES; OPTICAL PROPERTIES; PHOSPHATES; PHOTOLUMINESCENCE; SOLIDS; SPECTRA; X-RAY PHOTOELECTRON SPECTROSCOPY