Wavelength converting material and application thereof
View Patent ↗This disclosure discloses a wavelength converting material. The wavelength converting material comprises a plurality of wavelength converting particles, the wavelength converting particles having an average particle size greater than 5 μm, and wherein each of the wavelength converting particles has a particle size. 90% of the wavelength converting particles have the particle size smaller than a μm; 50% of the wavelength converting particles have the particle size smaller than b μm; and 10% of the wavelength converting particles have the particle size smaller than c μm; wherein (a−c)/b≦0.5.
1. A wavelength converting material, comprising:
a plurality of wavelength converting particles comprising a plurality of single particles and a plurality of aggregated particles;
wherein only 90% of the plurality of wavelength converting particles is smaller than a μm; only 50% of the plurality of wavelength converting particles is smaller than b μm; only 10% of the plurality of wavelength converting particles is smaller than c μm; and (a−c)/b≦0.5.
2. The wavelength converting material of claim 1 , wherein 0.1≦(a−c)/b≦0.5.
3. The wavelength converting material of claim 1 , wherein the plurality of single particles has an average particle size greater than 5 μm.
4. The wavelength converting material of claim 1 , wherein the plurality of aggregated particles has an average particle size greater than 5 μm.
5. The wavelength converting material of claim 1 , wherein more than 70% of the plurality of the wavelength converting particles belongs to the plurality of the single particle.
6. The wavelength converting material of claim 1 , wherein the plurality of wavelength converting particles has an average particle size which is greater than 5 μm and smaller than 20 μm.
7. The wavelength converting material of claim 1 , wherein the plurality of wavelength converting particles is selected from the group consisting of Y 3 Al 5 O 12 , Gd 3 Ga 5 O 12 :Ce, (Lu,Y) 3 Al 5 O 12 :Ce, SrS:Eu, SrGa 2 S 4 :Eu, (Sr,Ca,Ba)(Al,Ga) 2 S 4 :Eu, (Ca,Sr)S:(Eu,Mn), (Ca,Sr)S:Ce, (Sr,Ba,Ca) 2 Si 5 N 8 :Eu, (Ba,Sr,Ca) 2 SiO 4 :Eu, (Ca,Sr,Ba)Si 2 O 2 N 2 :Eu, CdZnSe, and a combination thereof.
8. A light-emitting device, comprising:
a light-emitting stack configured to emit a first light with a first peak wavelength; and
a wavelength converting material having a plurality of wavelength converting particles and formed on the light-emitting stack for absorbing the first light and emitting a second light with a second peak wavelength different from the first peak wavelength;
wherein the plurality of wavelength converting particles comprises a plurality of single particles and a plurality of aggregated particles,
wherein only 90% of the plurality of wavelength converting particles is smaller than a μm; only 50% of the plurality of wavelength converting particles is smaller than b μm; and 10% of the plurality of wavelength converting particles is smaller than c μm; and (a−c)/b≦0.5.
9. The light-emitting device of claim 8 , wherein the plurality of wavelength converting particles is dispersed in a transparent material.