We have synthesized a CaMgSi 2 O 6 :Eu 2+ blue phosphor via a solid-state reaction method. The CaMgSi 2 O 6 :Eu 2+ phosphor has monoclinic structure with a space group of C2/c (15), and an emission band peaking at 450 nm (blue) due to the 4f 7 -4f 6 5d transition of the Eu 2+ ion. The emission intensity at 100℃ is 54% of the value at room temperature. A white LED was fabricated by integrating a UV LED (400 nm) with our blue phosphor plus two commercial green and red phosphors. The white LED shows a color temperature of 3500 K with a color rendering index of 87 (x = 0.3936, y = 0.3605), and a luminous efficiency of 18 lm/W. The white LED shows a luminance maintenance of 97% after operation at 350 mA for 400 hours at 85℃.

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