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White light-emitting Mg0.1Sr1.9SiO4:Eu2+ phosphors
- Source :
-
Journal of Luminescence . Mar2008, Vol. 128 Issue 3, p489-493. 5p. - Publication Year :
- 2008
-
Abstract
- Abstract: Divalent europium-activated strontium orthosilicate Sr2SiO4:Eu2+ and Mg0.1Sr1.9SiO4:Eu2+ phosphors were synthesized through the solid-state reaction technique. Their luminescent properties under ultraviolet excitation were investigated. The X-ray diffraction (XRD) results show that these phosphors are of α′-Sr2SiO4 phase with a trace of β-Sr2SiO4. Doping of Eu2+ ion into the crystal lattice results in the lattice constant being expended, while Mg2+ makes the lattice constant shrinking. A solid solution with the same crystal structure is formed when Eu2+ or Mg2+ substitutes part of Sr2+ ions and occupies the same lattice sites. The Sr2SiO4:Eu2+ phosphors show two emission spectra peaked at 535 and 473nm originated from the 5d–4f transition of Eu2+ ion doped in two different Sr2+ sites in the host lattice. By substitution of 0.1mol of Sr2+ with Mg2+, these two emission bands are tuned to be in the blue and yellow region (459 and 564nm for Mg0.1Sr1.88SiO4:Eu0.02), respectively. The tuning effect is discussed. With a combination of the blue and yellow emission bands the phosphors show white color, indicating that these phosphors may become promising phosphor candidates for white light-emitting diodes (LEDs). [Copyright &y& Elsevier]
- Subjects :
- *LIGHT emitting diodes
*PHOSPHORS
*PHOTOLUMINESCENCE
*X-ray diffraction
Subjects
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 128
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 27832023
- Full Text :
- https://doi.org/10.1016/j.jlumin.2007.09.023