US 6,982,045 B2 | ||
Light emitting device having silicate fluorescent phosphor | ||
Hisham Menkara, Mableton, Ga. (US); and Christopher Summers, Atlanta, Ga. (US) | ||
Assigned to Phosphortech Corporation, Lirhia Springs, Ga. (US) | ||
Filed on Jul. 28, 2003, as Appl. No. 10/628,115. | ||
Claims priority of provisional application 60/471619, filed on May 17, 2003. | ||
Prior Publication US 2004/0227465 A1, Nov. 18, 2004 | ||
Int. Cl. C09K 11/59 (2006.01) |
U.S. Cl. 252—301.4F | 13 Claims |
1. A composition of matter useful as a phosphor material in light emitting diodes, which composition comprises a material
described by the formula:
SrxBayCazSiO4:Eu,B
in which x, y, and z are each independently any value between 0 and 2, including 0 and 2 and subject to the proviso that the
sum of x, y, or z is equal to at least 1; and wherein B is selected from the group consisting of: Ce, Mn, Ti, Pb, and Sn,
and wherein at least 50% of all of the europium present is present in the divalent state.
|