Enhancement of fluorescence by Ce3+ doping in green-emitting Ca15(PO4)2(SiO4)6:Eu2+ phosphor for UV-based w-LEDs
| Autor: | Seyoon Hur, Dong Wan Kim, Hee Jo Song, Hee Suk Roh, Kug Sun Hong |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Photoluminescence Process Chemistry and Technology Doping Analytical chemistry Phosphor Thermoluminescence Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Absorbance law Materials Chemistry Ceramics and Composites Quantum efficiency Photoluminescence excitation Light-emitting diode |
| Zdroj: | Ceramics International. 39:9791-9795 |
| ISSN: | 0272-8842 |
| Popis: | Ca 15 (PO 4 ) 2 (SiO 4 ) 6 :Eu 2+ ,Ce 3+ phosphor was synthesized by a solid-state reaction. Doping of Ce 3+ into the Ca 2+ site of the Ca 15 (PO 4 ) 2 (SiO 4 ) 6 :Eu 2+ phosphor enhanced the Eu 2+ emission greatly, as observed by measuring the photoluminescence properties and the quantum efficiency levels. The mechanism of the enhancement of the Eu 2+ emission by Ce 3+ doping was investigated by comparing the normalized photoluminescence (PL) spectra with the normalized photoluminescence excitation (PLE) spectra and analyzing the absorbance and the fluorescence lifetime of the Ca 15 (PO 4 ) 2 (SiO 4 ) 6 :Eu 2+ ,Ce 3+ phosphors. Furthermore, the thermoluminescence properties were measured to confirm the thermal stability of the synthesized phosphor when exposed to the high junction temperature of recent high-power LED chips, showing a thermal activation energy barrier of 0.213 eV. |
| Databáze: | OpenAIRE |
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