Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides
Reexamination Certificate
2004-09-30
2008-12-30
Koslow, C. Melissa (Department: 1793)
Compositions
Inorganic luminescent compositions
Compositions containing halogen; e.g., halides and oxyhalides
C257S098000, C313S503000, C313S467000, C313S486000, C313S582000, C313S584000
Reexamination Certificate
active
07470378
ABSTRACT:
Sialon fluorescent materials with activated Eu or other rare earth ions have been known as fluorescent materials capable of being excited by blue light to emit yellow light. An oxynitride fluorescent material can emit light having a far wider range of wavelengths than ever before, and can be included in a light-emitting device. A fluorescent material contains as a main component a crystal phase having a general formula La3Si8N11O4or La3Si8−xAlxN11−xO4+xwhere 0<x≦4, to which an optically active element (M) including one or more elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu is added and contained as a luminescence center component.
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J. van Krevel, “On new rare-earth doped M-Si-Al-O-N materials”, Chapater 6, pp. 73-87, 2000.
Journal of Materials Science 17 (1982)2359-2364; Phase Relationships in the System Si3N4-SiO2-La2O3, , pp. 2359-2364.
Chem., Mater, 1992 4, 260-267, Reviews, Nitrogen-15 and Oxygen-17 NMR Spectroscopy of Silicates and Nitrogen Ceramics, 1992 American Chemical Society.
“The structures of the Ce and La n-Phases RE3Si8-XAlXO4=X(X≈1.75 for RE=Ce, X≈1.5for RE=La), determined by single -crystal X-ray and time-of-flight neutron powder diffraction, respectively” pp. 2358-2362, The Royal Society of Chemistry 2001.
Kanesaka Manabu
Koslow C. Melissa
National Institute For Materials Science
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