Patent ID: 7427366

Claim:
A mixture of two or more phosphors, one of a first emission energy and the second of a lower emission energy, comprising: the first phosphor of the formula (I) Sr 1-x3 Ca x3 Ga 2 S 4 :Eu:xGa 2 S 3 (I) wherein x is 0 to about 0.2, wherein x3 is 0.0001 to 1, and wherein a minor part of the europium component is substituted with praseodymium in an efficiency enhancing amount; and the second phosphor of the formula (II): Sr x2 Ca 1-x2 S:Eu 2+ , Y (II) wherein x2 is a number from 0 to 1.0, and Y is one or more halides in atomic or ionic form.