Morpho-structural and luminescence investigations on yttrium silicate based phosphors prepared with different precipitating agents

• Authors: Laura Muresan , Adrian Cadis , Ioana Perhaita , Emil Indrea
• Languages of publication: EN

Abstracts

EN

Yttrium silicate doped with cerium (Y2SiO5:Ce) was obtained from Y-Ce-Si based precursors prepared by the simultaneous addition of reagents (SimAdd) technique. The synthesis of the precursors was done in well controlled conditions using ammonium oxalate, ammonium carbonate or urea as precipitating agents. Results regarding the influence of precipitating agents on the morpho structural and photoluminescent characteristics of Y2SiO5:Ce are reported. The TG analysis in correlation with EGA, FT-IR and XRD investigations reveals the formation of oxalate, hydroxy-carbonate or hydroxy-nitrate based compounds, the same as the conversion of the precursors to well crystallized yttrium silicate. XRD patterns show that the precursors are amorphous except for the sample prepared with ammonium oxalate. Depending on the precipitation conditions, the phosphors phase composition varies from single phase (X2-Y2SiO5) to a mixture of phases (X2-Y2SiO5, X1-Y2SiO5, Y2O3). Under UV excitation, phosphors exhibit the specific blue emission of cerium with an intensity that varies from 175.8% (urea) to 96.0% (ammonium carbonate) and to 78.5% (ammonium oxalate). The emission intensity depends on the phase purity and order degree of the phosphors. PACS Classification codes:78.55 Hx, 81.20Fw

Keywords

EN

Yttrium silicate; Luminescence; Precursors; Precipitation

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2014
• Volume: 12
• Issue: 10
• Pages: 1023-1031

Dates

published

1 - 10 - 2014

online

15 - 5 - 2014

Contributors

author

Laura Muresan

• “Babeş Bolyai” University

author

Adrian Cadis

• “Babeş Bolyai” University

author

Ioana Perhaita

• “Babeş Bolyai” University

author

Emil Indrea

• National Institute for R &D of Isotopic and Molecular Technologies

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Identifiers

DOI

10.2478/s11532-014-0553-z