Patent ID: 8313844

Claim:
A phosphor comprising M 1 , Eu and Si, where M 1 represents at least one of Sr, Ba and Ca, and comprising a crystal represented by (M 1 ,Eu) 2 SiO 4 as a main crystal, wherein a divalent Eu ion concentration of the phosphor is 90% or more, with respect to a total amount of divalent and trivalent Eu ions, and a (M 1 +Eu)/Si molar ratio of the phosphor is less than 2, wherein the (M 1 +Eu)/Si molar ratio is a sum of a molar ratio of M 1 to Si and a molar ratio of Eu to Si, and further comprising a plurality of phosphor particles, wherein each of the phosphor particles comprises a phosphor core and a plurality of fibrous bodies present on a surface of the phosphor core, and at least one end of each of the fibrous bodies is embedded in the phosphor core.