Patent ID: 8088303

Claim:
A fluorescent powder used in a warm-white light-emitting diode (LED) has the substrate of garnet cubic crystal structure with at least one of an Ce +3 and Pr +3 activating agent and is based on yttrium-gadolinium garnet containing ions of B +3 , F −1 , and N −3 with its stoichiometric formula as (Gd 1-x-y-z Y x Ce y Dy z ) 3 Al 5-p B p O 12-q (F,N) q , wherein the stoichiometric coefficients are x=0.03˜0.5, y=0.001˜0.1, z=0.001˜0.005, p=0.01˜0.5, and q=0.001˜0.10, respectively.