Reduction of Eu{sup 3+} to Eu{sup 2+} in MAl{sub 2}Si{sub 2}O{sub 8} (M=Ca, Sr, Ba) in air condition

Journal Article · Wed Jul 15 00:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.04.009· OSTI ID:21370466

Cuimiao, Zhang; Jun, Yang ^[1]; Cuikun, Lin; Chunxia, Li ^[1]

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1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Remin Street, Changchun 130022 (China)

In general, the reduction of Eu{sup 3+} to Eu{sup 2+} in solids needs an annealing process in a reducing atmosphere. In this paper, it is of great interest and importance to find that the reduction of Eu{sup 3+} to Eu{sup 2+} can be realized in a series of alkaline-earth metal aluminum silicates MAl{sub 2}Si{sub 2}O{sub 8} (M=Ca, Sr, Ba) just in air condition. The Eu{sup 2+}-doped MAl{sub 2}Si{sub 2}O{sub 8} (M=Ca, Sr, Ba) powder samples were prepared in air atmosphere by Pechini-type sol-gel process. It was found that the strong band emissions of 4f{sup 6}5d{sup 1}-4f{sup 7} from Eu{sup 2+} were observed at 417, 404 and 373 nm in air-annealed CaAl{sub 2}Si{sub 2}O{sub 8}, SrAl{sub 2}Si{sub 2}O{sub 8} and BaAl{sub 2}Si{sub 2}O{sub 8}, respectively, under ultraviolet excitation although the Eu{sup 3+} precursors were employed. In addition, under low-voltage electron beam excitation, Eu{sup 2+}-doped MAl{sub 2}Si{sub 2}O{sub 8} also shows strong blue or ultraviolet emission corresponding to 4f{sup 6}5d{sup 1}-4f{sup 7} transition. The reduction mechanism from Eu{sup 3+} to Eu{sup 2+} in these compounds has been discussed in detail. - Graphical abstract: It is of great importance to find that the reduction of Eu{sup 3+} to Eu{sup 2+} can be realized in a series of alkaline-earth metal aluminum silicates MAl{sub 2}Si{sub 2}O{sub 8} (M=Ca, Sr, Ba) just in air condition.

• OSTI ID: 21370466
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 7; Other Information: DOI: 10.1016/j.jssc.2009.04.009; PII: S0022-4596(09)00174-1; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM SILICATES
ANNEALING
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CATHODOLUMINESCENCE
DOPED MATERIALS
ELECTRON BEAMS
EUROPIUM IONS
PHOTOLUMINESCENCE
PRECURSOR
REDUCTION
SOL-GEL PROCESS
STRONTIUM COMPOUNDS
ULTRAVIOLET RADIATION
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BEAMS
CHARGED PARTICLES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
EMISSION
FLUIDS
GASES
HEAT TREATMENTS
IONS
LEPTON BEAMS
LUMINESCENCE
MATERIALS
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHOTON EMISSION
RADIATIONS
SILICATES
SILICON COMPOUNDS