Abstract
Green emitting Eu 2-doped Ca 2SiO 4 phosphors were synthesized by three different methods (a conventional solid state reaction (SSR) method, a novel liquid phase precursor approach using SiO 2 sol (LPP-SiO 2(sol)) and water-soluble silicon compound (LPP-WSS)). The obtained phosphors exhibited a broad excitation spectrum ranging from 225 to 450 nm and a strong green emission peak at 502 nm due to the 4f 65d 1→4f 7( 8S 7/2) transition of Eu 2. The highest luminescent intensity was obtained for the samples fired at 1100 °C. The dependence of luminescence properties on Eu 2 concentration for the phosphors synthesized using LPP-WSS method was also examined from 0.1 to 5.0 mol% and the maximum emission intensity was observed at 3.0 mol% Eu 2. A detailed analysis using various characterizations revealed that phosphors produced by the LPP-WSS process exhibited more homogenous phase distribution and higher luminescence intensity than those from the other two processes, which suggested the potential application of Ca 2SiO 4:Eu 2 in white light-emitting diodes and fluorescence lamps.
Original language | English |
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Pages (from-to) | 68-74 |
Number of pages | 7 |
Journal | Journal of Solid State Chemistry |
Volume | 189 |
DOIs | |
Publication status | Published - 2012 May |
Keywords
- Eu concentration
- Luminescence
- Silicate phosphor
- Thermal analysis
- White LEDs
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry