Patent ID: 9708531
Date: 2017-07-18
CPC Classifications: C09K,H01L

Claim:
1. A fluorescent substance that has an emission peak wavelength at 584 nm to 630 nm upon being excited by a light source of 460 nm, wherein: the fluorescent substance is Sr the fluorescent substance has a formation phase whose main phase shows, in an X-ray diffraction pattern using CuKα radiation with an intensity of a diffraction peak in a Bragg angle range of 17.9° to 18.5° taken as 100%, a relative intensity of the diffraction peak in a range of 150% to 310% in a Bragg angle range of 24.5° to 25.1° and a relative intensity of the diffraction peak in a range of 320% to 550% in a Bragg angle range of 34.8° to 35.4°.