Fluorescent substance and light-emitting device employing the same

摘要

The fluorescent substance according to the embodiment is generally represented by (M 1-x EC x ) a Si b AlO c N d , and is a kind of the Sr 2 Si 7 Al 3 ON 13 phosphors. The substance is in the form of crystals having a mean grain size of 20 to 100 µm, and the aspect ratio thereof is in the range of 2 to 4. This substance emits luminescence having a peak in the wavelength range of 580 to 660 nm when excited by light of 250 to 500 nm. The embodiment also provides a light-emitting device comprising this substance in combination with a light-emitting element and a green light-emitting fluorescent substance.