Patent ID: 11898080
Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A phosphor comprising an inorganic substance comprising an Eu element, an M[3] element (M[3] is at least one kind of element selected from a group consisting of Al, Y, La, and Gd), a Si element, a nitrogen element, and, if necessary, at least one kind of element selected from a group consisting of an M[1] element (M[1] is a Li element), an M[2] element (M[2] is at least one kind of element selected from a group consisting of Mg, Ca, Ba, and Sr), and an oxygen element,
wherein the inorganic substance is represented by a composition of M[1]aEubM[2]cM[3]dSieOfNg (where a+b+c+d+e+f+g=1) wherein parameters a, b, c, d, e, f, and g are represented by values respectively satisfying:
0≤a≤0.01,
0.006≤b≤0.15,
0≤c≤0.15,
0.001≤d≤0.07,
0.3≤e≤0.35,
0≤f≤0.05, and
0.5≤g≤0.56;
the phosphor emitting light having a local maximum value of a emission peak at a wavelength in a range of 760 nm or more and 850 nm or less upon irradiation by an excitation source.