Patent ID: 8323528

Claim:
A composition comprising: a phosphor that emits radiation when excited by incident radiation with a wavelength about 100 nm and 750 nm, wherein the phosphor has the following chemical formula: M 3 Ga 5-x A x DO (m+(3y/2)+(tz/2)) :(yCr 3+ ,zT t+ ), wherein M is an ion selected from Gd 3+ , Lu 3+ , Y 3+ , Bi 3+ , Ca 2+ , Sr 2+ , Sc 3+ , or combinations thereof; wherein A is an ion selected from: Al 3+ , Sc 3+ , In 3+ , or combinations thereof, wherein 0≦x<5; wherein D is selected from Si 4+ , Ge 4+ , Ti 4+ , Zr 4+ , Hf 4+ , Ga 0.5 Nb 0.5 , Ga 0.5 Ta 0.5 , Cr 4+ , Cr 6+ or combinations thereof; wherein Nb and Ta have an oxidation state selected from: +3, +4, or +5; wherein D is selected from Nb or Ta, if one of the M of M 3 is Ca 2+ , Sr 2+ , or combinations thereof; wherein y is about 0.00001 to 0.075; wherein z is about 0 to 0.075; wherein T is selected from: (a) Ce 3+ , Pr 3+ , Pm 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , Th 4+ or combinations thereof; (b) Mg 2+ , Zn 2+ , Pb 2+ , or combinations thereof; or (c) Li + , Na + , or combinations thereof; t is the charge of the cation T, which is a charge selected from: +1, +2, +3, or +4; and m is a number that, when multiplied by (−2) counter-balances the positive charge imparted by the [M 3 Ga 5-x A x D] moiety.