Fluorescence material
View Patent ↗The present invention fluorescence material has a particle diameter of the crystal area defined as d c , and the scope of d c is: 150 nm≧d c ≧10 nm. The coat of the outside of the fluorescence material has one sheet of coating medium at least. Of course, there is at least a geometrical etching layer on the particle of the fluorescence material. The above-described structures will promote the extraction efficiency of light.
1. 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.
2. 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;
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 material is defined as r, and a range of r meets the equation: 3≧r>1.
3. The fluorescence material of claim 2 , 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.
4. A fluorescence material, comprising:
a crystallized core portion;
at least one coating medium layer coated on the surface of crystallized core portion for surrounding the crystallized core portion; and
wherein 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 the fluorescence material meets the following equation: a refractive index of the fluorescence material>=a refractive index of the coating medium>=a refractive index of the encapsulation.
5. The fluorescence material of claim 4 , wherein the a plurality of microstructures are taper-shaped, rectangular-shaped, or round-shaped.
6. The fluorescence material of claim 4 , 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.
7. The fluorescence material of claim 5 , wherein the at least a layer of the coating medium comprises a plurality of refractive indexes of n 1 , n 2 , . . . , n n from an inner side to an outer side of the coating medium, and the fluorescence material meets the following equation: the refractive index of the fluorescence material>=n 1 >=n 2 . . . >=n n >=refractive index of the encapsulation.