Patent 7808006 was granted and assigned to National Chiao Tung University on October, 2010 by the United States Patent and Trademark Office.
A phosphor has a general formula of (M1-m-nCemEun)3Al2O5X2, wherein M is at least one selected from the group consisting of Ca, Sr and Ba; and X is at least one selected from the group consisting of Cl and Br, while 0<m<1 and 0<n<1.