Patent ID: 8187497

Claim:
A method for preparing a phosphor, the method comprising: preparing a precursor solution by mixing strontium nitrate (Sr(NO 3 ) 2 ), tetraethyl orthosilicate (TEOS), and europium oxide (Eu) with each other; forming a gel by heating the precursor solution; drying the gel specimen; performing calcination by removing water and organic materials from the dried gel; and preparing a phosphor by reducing the Eu of the gel, wherein pH of the precursor solution is adjusted to 1 in order to obtain spherical phosphor particles, and wherein the strontium nitrate, the TEOS and the Eu of the precursor solution are mixed with each other in a ratio of (3-x) mol to 1 mol to x mol, where 0.001≦x≦1, respectively.