Illumination system comprising a radiation source and a...

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

Reexamination Certificate

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C252S30140R, C257S088000, C313S503000

Reexamination Certificate

active

07544309

ABSTRACT:
The invention is concerned with an illumination system, comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing a part of light emitted by the radiation source and emitting light of wavelength different from that of the absorbed light; wherein said at least one phosphor is an oxido-nitrido-silicate of general formula EA2-zSi5-aBaN8-aOa:Lnz, wherein 0<z≦1 and 0<a<5; comprising at least one element EA selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least one element B selected from the group consisting of Al, Ga and In, and being activated by a lanthanide selected from the group consisting of cerium, europium, terbium, praseodymium and mixtures thereof. The invention is also concerned with a phosphor, which is an oxido-nitrido-silicate of the general formula EA2-zSi5-aBaN8-aOa:Lnz, wherein 0<z≦1 and 0<a<5; comprising at least one element EA selected from the group consisting of Mg, Ca, Sr, Ba and Zn and at least one element B selected from the group consisting of Al, Ga and In, and being activated by a lanthanide selected from the group consisting of cerium, europium, terbium and mixtures thereof.

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de Graaf et al. “Long wavelength Eu2+ emission in Eu-doped Y-Si-Al-O-N glasses”. Journal of the European Ceramic Society. vol. 23, Issue 7, Jun. 2003, pp. 1093-1097. Received Aug. 30, 2001; revised Jun. 25, 2002; accepted Jul. 6, 2002. ; Available online Sep. 18, 2002.

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