Phosphor, light-emitting device, illumination device and image display device
AssigneeMitsubishi Chemical Corporation
InventorsByungchul Hong, Ayuko Onozuka
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Abstract
The present invention addresses providing a novel narrowband red phosphor having a high internal quantum efficiency, a short afterglow time, and a large number of emission components in a short-wavelength region with high red visibility. This is solved by a phosphor characterized by including a crystalline phase that has a predetermined composition and having a specific peak in a powder X-ray diffraction pattern.
Claims20
A phosphor including a crystalline phase which has a composition represented by Formula [1] below, and having peaks in regions 1 to 5 shown below in a powder X-ray diffraction pattern measured using CuKα rays (1.5418 Å):
- AxDyMnzFw [1]
- (in Formula [1],
- element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
- element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
- x, y, z, and w each independently are values satisfying formulas below:
- 1.5≤x≤2.5,
- 0.5≤y<1,
- y+z=1,
- 5.0≤w≤7.0),
- 20.7°≤2θ≤21.0°, Region 1:
- 26.1°≤2θ≤26.7°, Region 2:
- 34.6°≤2θ≤35.6°, Region 3:
- 38.3°≤2θ≤39.4°, and Region 4:
- 49.6°≤2θ≤50.7°. Region 5:
A phosphor including a crystalline phase which has a composition represented by Formula [1] below, wherein
- a crystal system of the crystalline phase is a hexagonal system and a unit cell volume calculated from a lattice constant is 344.0 Å3 or more and 375.0 Å3 or less:
- AxDyMnzFw [1]
- (in Formula [1],
- element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
- element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
- x, y, z, and w each independently are values satisfying formulas below:
- 1.5≤x≤2.5,
- 0.5≤y<1,
- y+z=1,
- 5.0≤w≤7.0).
A phosphor including a crystalline phase which has a composition represented by Formula [1] below, wherein
- a ratio (IN/Imax) of an intensity IN of a peak present at 2θ=32° to 33° in a powder X-ray diffraction pattern and a strongest peak intensity Imax in a powder X-ray diffraction pattern measured using CuKα rays (1.5418 Å) is 0.05 or less:
- AxDyMnzFw [1]
- (in Formula [1],
- element A represents one or more elements selected from the group consisting of Li, Na, K, Rb, and Cs,
- element D represents two or more elements selected from the group consisting of Si, Ge, and Ti, and
- x, y, z, and w each independently are values satisfying formulas below:
- 1.5≤x≤2.5,
- 0.5≤y<1,
- y+z=1,
- 5.0≤w≤7.0).
Dependencies are inferred from the claim text.