Phosphor-converted LED
View Patent ↗A light source and method for fabricating the same are disclosed. The light source includes a die, a light conversion component, and a scattering ring. The die emits light of a first wavelength through a top surface of the die and one or more side surfaces of the die, and is bonded to a mounting substrate. The light conversion component converts light of the first wavelength to light of a second wavelength, the light conversion component having a bottom surface bonded to the top surface of the die. The light conversion component has lateral dimensions such that a space exists around the die, the space being bounded by the substrate and the light conversion component. The scattering ring is positioned in the space such that a portion of the light emitted from the side surfaces of the die is scattered into the light conversion component.
1. A light source comprising:
a die that emits light of a first wavelength through a top surface of said die and one or more side surfaces of said die, said die being bonded to a surface of a mounting substrate;
a light conversion component comprising a layer of luminescent material that converts light of said first wavelength to light of a second wavelength, said light conversion component having a bottom surface bonded to said top surface of said die, said light conversion component having lateral dimensions such that a space exists around said die, said space being bounded by said substrate and said light conversion component; and
a scattering ring surrounding said side surfaces of said die and being positioned in said space such that a portion of said light emitted from said side surfaces of said die is scattered into said light conversion component by said scattering ring,
wherein said scattering ring comprises a transparent material having particles suspended therein, and wherein said transparent material has a liquid precursor that wets said bottom surface of said light conversion component and said mounting substrate and wherein said space has dimensions that cause said liquid precursor to be drawn into said space by capillary action.
2. The light source of claim 1 wherein said transparent material comprises an epoxy.
3. The light source of claim 1 wherein said transparent material comprises silicone.
4. The light source of claim 1 wherein said particles comprise titanium oxide.
5. The light source of claim 1 wherein said light conversion component comprises a transparent material having particles of a phosphor suspended therein.
6. The light source of claim 1 wherein said light conversion component comprises a single crystal of phosphor having a lateral dimension equal to the lateral dimension of said light conversion component.
7. The light source of claim 1 wherein said light conversion component comprises a planar layer of transparent material having a luminescent material therein and a light processing layer comprising a layer of transparent material bonded to said planar layer, said light processing layer having a non-planar surface overlying said planar layer, wherein said light processing layer does not comprise scattering particles.
8. The light source of claim 1 further comprising a layer of transparent material over said mounting substrate shaped to provide an optical component having a non-planar surface corresponding to said die, wherein said layer of transparent material does not comprise scattering particles.