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2005
Luminescence
D 6540
Synthesis, Structure, and Luminescence Properties of Eu2+ and Ce3+ Activated
BaYSi4N7. — The title compounds are synthesized by solid state reactions of stoichio12- 011 metric
mixtures of Si3N4, Y, Ba, and Ce or Eu (1400—1650 °C, 12—24 h). As revealed
by powder XRD, undoped BaYSi4N7 crystallizes in the hexagonal space group P63mc
with Z = 2. Eu2+-doped BaYSi4N7 gives a broad green emission band centered between
503 and 527 nm depending on the Eu2+ concentration. Ce3+-doped BaYSi4N7 shows a
bright blue emission band with a maximum at about 417 nm, which is independent of
Ce3+ concentration. — (LI, Y. Q.; DE WITH, G.; HINTZEN*, H. T.;
J. Alloys Compd. 385 (2004) 1-2, 1-11; Lab. Solid State Chem. Mater. Sci.,
Eindhoven Univ. Technol., NL-5600 MB Eindhoven, Neth.; Eng.) — W. Pewestorf
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