Neutron Rietveld analysis for optimized CaMgSi2O6 : Eu2+ and its luminescent properties

We optimized synthesis conditions of blue-emitting CaMgSi2O6:Eu2+, (CMS:Eu2+) with conventional solid-state reaction and successfully determined structure parameters by Rietveld refinement method with neutron powder diffraction data. The final weighted R-factor R-wp was 6.42% and the goodness-of-fit indicator S (= R-wp/R-e) was 1.34. The refined lattice parameters of CMS:Eu2+ were a = 9.7472(3) angstrom, b = 8.9394(2) angstrom, and c = 5.2484(1) angstrom. The beta angle was 105.87(1)degrees. The concentration quenching process was observed, and the critical quenching concentration of Eu2+ in CMS:Eu2+ was about 0.01 mol and critical transfer distance was calculated as 12 angstrom. With the help of the Rietveld refinement and Dexter theory, the critical transfer distance was also calculated as 27 angstrom. In addition, the dominant multipolar interaction of CMS:Eu2+ was investigated from the relationship between the emission intensity per activator concentration and activator concentration. The dipole-dipole interaction was a dominant energy transfer mechanism of electric multipolar character of CMS:Eu2+.
Publisher
MATERIALS RESEARCH SOCIETY
Issue Date
2005-08
Language
ENG
Keywords

ENERGY-TRANSFER; PHOSPHORS; IONS

Citation

JOURNAL OF MATERIALS RESEARCH, v.20, no.8, pp.2061 - 2066

ISSN
0884-2914
DOI
10.1557/JMR.2005.0253
URI
http://hdl.handle.net/10203/1514
Appears in Collection
MS-Journal Papers(저널논문)
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