Silicate-based orange phosphors

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

Reexamination Certificate

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C252S30160F, C313S503000, C257S098000

Reexamination Certificate

active

07655156

ABSTRACT:
Novel orange phosphors are disclosed having the comprise silicate-based compounds having the formula (Sr,A1)x,(Si,A2)(O,A3)2+x:Eu2+, where A1is at least one divalent cation (a 2+ ion) including Mg, Ca, Ba, or Zn, or a combination of 1+ and 3+ cations; A2is a 3+, 4+, or 5+ cation, including at least one of B, Al, Ga, C, Ge, P; A3is a 1−, 2−, or 3− anion, including F, Cl, and Br; and x is any value between 2.5 and 3.5, inclusive. The formula is written to indicate that the A1cation replaces Sr; the A2cation replaces Si, and the A3anion replaces O. These orange phosphors are configured to emit visible light having a peak emission wavelength greater than about 565 nm. They have applications in white LED illumination systems, plasma display panels, and in orange and other colored LED systems.

REFERENCES:
patent: 2006/0027786 (2006-02-01), Dong et al.
patent: 2006/0028122 (2006-02-01), Wang et al.
patent: 2006/0158090 (2006-07-01), Wang et al.
patent: 2005-068269 (2005-03-01), None
patent: WO 2006/043745 (2007-04-01), None
patent: WO 2004/085570 (2007-10-01), None
Shigeo Shionoya, William M. Yen, et al. “Phosphor Handbook”, Edited under the Auspices of Phosphor Research Society, pp. 393, 418, 419 and 421, 1999.
G. Blasse and A. Brill, “Fluorescence of Eu2+-Activated Alkaline-Earth Aluminates”, Philips Res. Repts. 23, pp. 201-206, 1968.

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