Phosphor
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsJun-ichi Itoh, Ikuhiro Ozawa, Takayoshi Mori
Life of this patent
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Abstract
Provided is a phosphor, which is excited by a wide band of visible light, capable of emitting near-infrared light of high intensity. The phosphor comprises a crystal phase represented by a formula (1): MCuSi2O6 (where M comprises one or more of Ba, Sr and Ca), and a crystal phase represented by a formula (2): MCuSi4O10 (where M comprises one or more of Ba, Sr and Ca), wherein a ratio β of a diffraction peak intensity of MCuSi4O10 with respect to a diffraction peak intensity of MCuSi2O6 in an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuKα rays is 0<β≤0.50.
Claims12
A phosphor, comprising
- a crystal phase represented by a formula (1):
- MCuSi2O6 (where M comprises one or two or more of Ba, Sr and Ca) and
- a crystal phase represented by a formula (2):
- MCuSi4O10 (where M comprises one or two or more of Ba, Sr and Ca),
- wherein, in an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuKα rays, a ratio β of a diffraction peak intensity of MCuSi4O10 with respect to a diffraction peak intensity of MCuSi2O6 is 0<β≤0.50,
- wherein the phosphor further comprises a SiO2 crystal phase, and
- wherein, in an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuKα rays, a ratio α of a diffraction peak intensity of SiO2 with respect to a diffraction peak intensity of MCuSi2O6 is 0<α<0.45.
A near-infrared luminescent device comprising a phosphor, wherein the phosphor comprises a crystal phase represented by a formula (1):
- MCuSi2O6 (where M comprises one or two or more of Ba, Sr and Ca) and
- a crystal phase represented by a formula (2):
- MCuSi4O10 (where M comprises one or two or more of Ba, Sr and Ca), and
- wherein, in an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuKα rays, a ratio β of a diffraction peak intensity of MCuSi4O10 with respect to a diffraction peak intensity of MCuSi2O6 is 0<β≤0.50.
A fluorescent paint comprising a phosphor, wherein the phosphor comprises a crystal phase represented by a formula (1):
- MCuSi2O6 (where M comprises one or two or more of Ba, Sr and Ca) and
- a crystal phase represented by a formula (2):
- MCuSi4O10 (where M comprises one or two or more of Ba, Sr and Ca), and
- wherein, in an X-ray diffraction (XRD) pattern obtained by powder XRD measurement using CuKα rays, a ratio β of a diffraction peak intensity of MCuSi4O10 with respect to a diffraction peak intensity of MCuSi2O6 is 0<β≤0.50.
Dependencies are inferred from the claim text.