ChemInform Abstract: Photoluminescence Properties and Energy-Transfer of Thermal-Stable Ce3+, Mn2+-Codoped Barium Strontium Lithium Silicate Red Phosphors.
✍ Scribed by Xinguo Zhang; Menglian Gong
- Publisher
- John Wiley and Sons
- Year
- 2011
- Weight
- 23 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Phosphors. -A series of red emitting phosphors, Ba1.8-x-y-zSrx(Li2)0.2SiO4:yCe 3+ ,zMn 2+ is prepared by solid state reaction of BaCO3, SrCO3, Li2CO3, SiO2, MnCO3, and CeO2 (90:10 N2/H2, 900 °C, 3 h). The best phosphor is obtained with an educt molar ratio of 65:10:10:50:10:5. The phosphors exhibit two emission bands under 365 nm excitation: one observed at 421 nm attributed to C 3+ emission, and the other found in the red region assigned to Mn 2+ emission through efficient Ce 3+ ↔Mn 2+ energy transfer. The Mn 2+ emission shifts to red upon replacement of Ba by Sr, which is due to a change of the crystal field. The composition-optimized phosphor exhibits strong and broad red emission and excellent thermal stability, suggesting its suitability for application as red component in near UV LEDs or high pressure Hg vapor lamps. -(ZHANG, X.; GONG*, M.;