Patent ID: 7611642

Claim:
An oxynitride phosphor represented by a composition formula M(1) 1-j M(2) j Si b Al c O d N e (composition formula I) or a composition formula M(1) 1-a-j M(2) j Ce a Si b Al c O d N e (composition formula II); and wherein in said composition formula I, said M(1) represents La, or a material in which La serves as a main component and in which at least one kind of chemical element(s) selected from a group composed of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu serve(s) as accessory component(s), said M(2) represents at least one kind of alkaline-earth metal(s), and a composition ratio j of said alkaline-earth metal(s) is 0<j≦1; in said composition formula II, said M(1) represents La, or a material in which La serves as a main component and in which at least one kind of chemical elements selected from a group composed of Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu serve(s) as accessory component(s), said M(2) represents at least one kind of alkaline-earth metal(s), said a representing a composition ratio of Ce is a real number complying with 0.1≦a≦1, and a composition ratio j of said alkaline-earth metal(s) is 0<j<1−a; in said composition formula I, II, said b representing a composition ratio of Si is a real number complying with b=(6−z)×f, said c representing a composition ratio of Al is a real number complying with c=(1+z)×g, said d representing a composition ratio of O is a real number complying with d=z×h, said e representing a composition ratio of N is a real number complying with e=(10−z)×i, said z is a real number complying with 0.1≦z≦3, said f is a real number complying with 0.7≦f≦1.3, said g is a real number complying with 0.7≦g≦3, said h is a real number complying with 0.7≦h≦3, and said i is a real number complying with 0.7≦i≦1.3; and the oxynitride phosphor contains 50% or more of a JEM phase.