| 简介 |
PROBLEM TO BE SOLVED : To provide a light-emitting device having a high color rendering property and a high luminous flux by using a phosphor which is excited efficiently by ultraviolet light or short wavelength visible light to emit light.
SOLUTION : There is provided a light-emitting device comprising : a light-emitting element which emits ultraviolet light or short wavelength visible light; and a phosphor which is excited by ultraviolet light or short wavelength visible light to emit light and represented by a general formula M1O2-aM2O-bM3X2 : M4 (where, M1 represents at least one kind of element selected from a group consisting of Si, Ge, Ti, Zr and Sn, M2 represents at least one kind of element selected from a group consisting of Mg, Ca, Sr, Ba and Zn, M3 represents at least one kind of element selected from a group consisting of Mg, Ca, Sr, Ba and Zn, X represents at least one kind of halogen element, M4 represents at least one kind of rare earth element including Eu2+ as an essential element, a is in the range of 0.1≤a≤1.3, and b is in the range of 0.1≤b≤0.25).
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