Illumination system comprising a yellow green-emitting...

Compositions – Inorganic luminescent compositions – Compositions containing halogen; e.g. – halides and oxyhalides

Reexamination Certificate

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C313S503000, C313S486000, C257S098000

Reexamination Certificate

active

07981321

ABSTRACT:
An illumination system, comprising a radiation source and a luminescent material comprising a phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said phosphor is a europium-activated oxonitridoalumosilicate of general formula AE1−y−zLnySi3-xAlx−aBaO1+x−yN4−x+y:Euz, wherein AE is an alkaline earth metal selected from the group of Sr, Ca, Ba, Mg and Zn; Ln is a lanthanide metal selected from the group of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y; B is a trivalent metal selected from the group of boron, gallium and scandium and a 0≦a<2, 0≦x<2, 0≦y≦1, 0.001<z≦0.1 provides white or colored illumination with high efficacy. The invention also relates to a luminescent material comprising a phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said phosphor is a europium-activated oxonitridoalumosilicate of general formula AE1−y−zLnySi3−xAlx−aBaO1+x−yN4−x+y: Euz, wherein AE is an alkaline earth metal selected from the group of Sr, Ca, Ba, Mg and Zn; Ln is a lanthanide metal selected from the group of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y; B is a trivalent metal selected from the group of boron, gallium and scandium and 0≦a<2, 0≦x<2, 0≦y≦1. 0.001<z≦0.1.

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Chem. Abstract citation 131:108438-1999, abstract for Uheda et al article “Synthesis and photoluminescence of the ceramic phosphors using LaSi3N5 as a host lattice”.
Uheda et al article “Synthesis and photoluminescence of the ceramic phosphors using LaSi3N5 as a host lattice”,Kotai no Hannosei Toronkai Koen Yokoshu, 10, 1999, abstract.
K. Uheda et al; “Synthesis and Luminescent Property of EU3+-Doped LASI3N5 Phosphor”, Journal of Luminescence, vol. 87-90, 2000, pp. 967-969, XP002405610.

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