Patent ID: 8017039

Claim:
A phosphor for a near-ultraviolet excitation light-emitting element represented by the formula (1): M 1 a M 2 b P c O 15 (1) wherein M l represents one or more elements selected from the group consisting of Ca, Sr, and Ba; M 2 represents one or more elements selected from the group consisting of Mg and Zn; a is a value in the range of 1.5 to 2.5 (both inclusive); b is a value in the range of 2.5 to 3.5 (both inclusive); and c is a value in the range of 3.5 to 4.5 (both inclusive), and a part of the element(s) M 1 and/or M 2 is substituted by an activating element (M 3 ).