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Synthesis and luminescence properties of glass ceramics containing MSiO3:Eu2+ (M=Ca, Sr, Ba) phosphors for white LED
- Source :
- Journal of Luminescence. 132:153-160
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Eu2+ doped silicate glasses were prepared of the system 52SiO2–48MO: xEu2+(in molar ratio, M=Ca, Sr, Ba; x=1, 3, 5, 7, 9) by a high temperature melt-quenching method in a reducing atmosphere. Glass ceramics containing MSiO3:Eu2+(M=Ca, Sr, Ba) nano-phosphors were obtained after the heat treatment of the glass samples. The excitation, emission spectra and lifetime decay curves of 4f65d1→4f7 of Eu2+ were measured and interpreted with respect to their crystal structures and multi-site occupations of divalent europium in the hosts. Their excitation bands mainly extend from 450 to 250 nm, which is adaptable to the main emission region of the UV LED chip. With UV light excitation, the Eu2+ emission in CaSiO3, SrSiO3 and BaSiO3 shows blue, green and yellow colors centered at 440, 505 and 555 nm, respectively. The critical Eu2+concentration was studied and determined to be x=5 for both CaSiO3 and SrSiO3 and x=7 for BaSiO3 phosphors. The results show that the Eu2+ doped glass ceramic phosphors containing MSiO3 (M=Ca, Sr, Ba) nano-crystals can be used as potential matrix materials for a high power white LED pumped by the UV LED chip.
- Subjects :
- Glass-ceramic
Materials science
Reducing atmosphere
Doping
Biophysics
Analytical chemistry
Mineralogy
chemistry.chemical_element
Phosphor
General Chemistry
Condensed Matter Physics
Biochemistry
Atomic and Molecular Physics, and Optics
law.invention
chemistry
law
visual_art
visual_art.visual_art_medium
Emission spectrum
Ceramic
Luminescence
Europium
Subjects
Details
- ISSN :
- 00222313
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Journal of Luminescence
- Accession number :
- edsair.doi...........6dd2c2083dc1d786c5f29c990f680c4e