Patent ID: 8487330

Claim:
A europium-manganese-activated alkaline earth magnesium silicate phosphor comprising: a composition represented by the following chemical formula: (Sr 2-X-Y-Z-ω Ba X Mg Y Mn Z Eu ω )SiO 4 wherein: x, y, z, and ω are respectively coefficients satisfying: 0.7<x<1, 0<y<0.5, 0<z<0.1, y>z, and 0.01<ω<0.2; and when the phosphor is excited by a light having a peak in an ultraviolet-to-blue region, the phosphor emits light having: a peak in a blue region at a wavelength of 400 to 500 nm, a peak in a green-to-yellow region at a wavelength of 500 to 600 nm, and a peak in a red region at a wavelength of 600 to 700 nm.