Preparation, structure and photoluminescence properties of Eu2+ and Ce3+ -doped SrYSi4N7

Y.Q. Li, C.M. Fang, G. With, de, H.T.J.M. Hintzen

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Abstract

Undoped and Eu2+ or Ce3+-doped SrYSi4N7 were synthesized by solid-state reaction method at 1400¿1660 °C under nitrogen/hydrogen atmosphere. The crystal structure was refined from the X-ray powder diffraction data by the Rietveld method. SrYSi4N7 and EuYSi4N7, being isotypic with the family of compounds MYbSi4N7 (M=Sr, Eu, Ba) and BaYSi4N7, crystallize with the hexagonal symmetry: space group P63mc (No. 186), Z=2, a=6.0160 (1) Å, c=9.7894 (1) Å, V=306.83(3) Å3; and a=6.0123 (1) Å, c=9.7869 (1) Å, V=306.37(1) Å3, respectively. Photoluminescence properties have been studied for Sr1−xEuxYSi4N7 (x=0¿1) and SrY1−xCexSi4N7 (x=0¿0.03) at room temperature. Eu2+-doped SrYSi4N7 shows a broad yellow emission band peaking around 548¿570 nm, while Ce3+-doped SrYSi4N7 exhibits a blue emission band with a maximum at about 450 nm. SrYSi4N7:Eu2+ can be very well excited by 390 nm radiation, which makes this material attractive as conversion phosphor for LED lighting applications.
Original languageEnglish
Pages (from-to)4687-4694
Number of pages8
JournalJournal of Solid State Chemistry
Volume177
Issue number12
DOIs
Publication statusPublished - 2004

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