BLUE LIGHT-EMITTING PHOSPHOR AND LIGHT-EMITTING DEVICE USING SAME

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Provided is a blue light-emitting phosphor with which a silicate represented by the formula Sr3MgSi2O8 is activated by Eu, wherein when the Mg content is 1 mol, the blue light-emitting phosphor contains Eu in an amount within a range of 0.001 to 0.2 mol and further, rare earth metal elements selected from the group consisting of Sc, Y, Gd, Tb and La in an amount within a range of 0.0001 to 0.03 mol. Light emission intensity when excited by light at a wavelength of 350 to 430 nm is improved.