Patent ID: 8388862

Claim:
An inorganic luminescent material for solid-state white-light sources based on InGaN blue LEDs and containing yttrium oxide, oxides of rare earth metals, and/or aluminum oxide, having the formula: (Y 1−x−y Ce x ΣLn y ) 3+α Al 5 O 12+1.5α ; wherein α defines an increase in a stoichiometric index over a known value for yttrium-gadolinium garnet, wherein the increase in the stoichiometric index varies in the range of 0.033-2; wherein x is an atomic fraction of cerium, equal to 0.0001-0.1; wherein y is the sum of the atomic fractions of (ΣLn y ) the lanthanides which together with yttrium and cerium form an yttrium sub-lattice which, in addition to yttrium and cerium, include gadolinium (Gd p ), terbium (Tb q ), lanthanum (La r ) and/or ytterbium (Yb s ), and y=p+q+r+s; and wherein the atomic fraction of gadolinium is in the range of 0.01<p<0.7, the atomic fraction of terbium is in the range of 0.001<q<0.2, r,s are the atomic fractions of lanthanum and ytterbium and are in the range of 0.001<r,s<0.1, while the difference for all the compositions [1−x−(p+q+r+s)]=[1−x−y]>0.