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AssigneeDowa Mining Co., Ltd.
InventorsKenji Sakane, Akira Nagatomi, Masahiro Gotoh, Shuji Yamashita
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To provide a phosphor having an emission characteristic such that a peak wavelength of light emission is in a range from 580 to 680 nm, and having a high emission intensity, and having a flat excitation band with high efficiency for excitation light in a broad wavelength range from ultraviolet to visible light (wavelength range from 250 nm to 550 nm). For example, Ca3N2(2N), AlN(3N), Si3N4(3N), Eu2O3(3N) are prepared, and after weighing and mixing a predetermined amount of each raw material, raw materials are fired at 1500° C. for 6 hours, thus obtaining the phosphor including a product phase expressed by a composition formula CaAlSiN3:Eu and having an X-ray diffraction pattern satisfying a predetermined pattern.
A phosphor, comprising a phase showing a diffraction peak with relative intensity of 10% or more in the Bragg angle (2θ) range from 36.5° to 37.5° and from 41.9° to 42.9° of the X-ray diffraction pattern as a main product phase, when the relative intensity of the diffraction peak having a highest intensity in a powder X-ray diffraction pattern by CoKα ray is defined as 100%.
A phosphor, comprising a phase showing a diffraction peak with relative intensity of 10% or more in the Bragg angle (2θ) range from 36.5° to 37.5° and from 41.9° to 42.9°, and from 56.3° to 57.3° of the X-ray diffraction pattern, when the relative intensity of the diffraction peak having a highest intensity in a powder X-ray diffraction pattern by CoKα ray is defined as 100%.
A phosphor, comprising a phase showing a diffraction peak with relative intensity of 10% or more in the Bragg angle (2θ) range from 36.5° to 37.5° and from 40.9° to 41.9°, 41.9° to 42.9°, 56.3° to 57.3°, 66.0° to 67.0°, 75.8° to 76.8°, and 81.0° to 83.0°, when the relative intensity of the diffraction peak having a highest intensity in a powder X-ray diffraction pattern by CoKα ray is defined as 100%.
Dependencies are inferred from the claim text.