Patent ID: 8257829

Claim:
A fluorescence material applied to a light emitting device, being of a shape having a long axis diameter and a short axis diameter, comprising: a crystallized core portion having a diameter d c , and a range of the particle diameter d c being about 150 nm≧d c≧ 10 nm; at least one coating medium layer coated on the surface of crystallized core portion for surrounding the crystallized core portion; and a plurality of microstructures formed on the surface of the at least one coating medium layer to thus reduce the possibility of total reflection of an incident light; wherein a ratio of the long axis diameter to the short axis diameter of the fluorescence particle diameter is defined as r, and a range of r meets the equation 3≧r>1 to thus increase light extraction efficiency of the fluorescence material particle; wherein a refractive index of the crystallized core portion≧a refractive index of the at least one coating medium layer; and wherein the plurality of microstructures are a plurality of protrusions of an identical shape or a plurality of cavities of an identical shape formed evenly on the at least one coating medium layer.