Preparation, structure and photoluminescence properties of Eu{sup 2+} and Ce{sup 3+}-doped SrYSi{sub 4}N{sub 7}
- Laboratory of Solid State and Materials Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)
Undoped and Eu{sup 2+} or Ce{sup 3+}-doped SrYSi{sub 4}N{sub 7} were synthesized by solid-state reaction method at 1400-1660{sup o}C under nitrogen/hydrogen atmosphere. The crystal structure was refined from the X-ray powder diffraction data by the Rietveld method. SrYSi{sub 4}N{sub 7} and EuYSi{sub 4}N{sub 7}, being isotypic with the family of compounds MYbSi{sub 4}N{sub 7} (M=Sr, Eu, Ba) and BaYSi{sub 4}N{sub 7,} crystallize with the hexagonal symmetry: space group P6{sub 3}mc (No. 186), Z=2, a=6.0160 (1)A, c=9.7894 (1)A, V=306.83(3)A{sup 3}; and a=6.0123 (1)A, c=9.7869 (1)A, V=306.37(1)A{sup 3}, respectively. Photoluminescence properties have been studied for Sr{sub 1-x}Eu{sub x}YSi{sub 4}N{sub 7} (x=0-1) and SrY{sub 1-x}Ce{sub x}Si{sub 4}N{sub 7} (x=0-0.03) at room temperature. Eu{sup 2+}-doped SrYSi{sub 4}N{sub 7} shows a broad yellow emission band peaking around 548-570nm, while Ce{sup 3+}-doped SrYSi{sub 4}N{sub 7} exhibits a blue emission band with a maximum at about 450nm. SrYSi{sub 4}N{sub 7}:Eu{sup 2+} can be very well excited by 390nm radiation, which makes this material attractive as conversion phosphor for LED lighting applications.
- OSTI ID:
- 20658248
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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