High-power white leds

Abstract

A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.

1 . A light emitting apparatus comprising:
 a radiation source being not encapsulated by a dome;   an optic device comprising a top surface distal the radiation source, a bottom surface proximal the radiation source and having a width smaller than that of the top surface, and a transparent sidewall extending between the top surface and the bottom surface; and   a down conversion material disposed adjacent to or on the top surface.   
     
     
         2 . The light emitting apparatus of  claim 1 , further comprising an aperture between the optic device and the radiation source. 
     
     
         3 . The light emitting apparatus of  claim 1 , further comprising a sealant forming an interface between the radiation source and the optic device. 
     
     
         4 . The light emitting apparatus of  claim 1 , further comprising a lens placed on the optic device. 
     
     
         5 . The light emitting apparatus of  claim 1 , further comprising a layer near the down conversion material and comprising scattering particles. 
     
     
         6 . The light emitting apparatus of  claim 1 , wherein the down conversion material comprises a phosphor or quantum dots. 
     
     
         7 . The light emitting apparatus of  claim 1 , wherein the down conversion material comprises multiple phosphors or multiple quantum dots to produce different colored down-converted radiation. 
     
     
         8 . The light emitting apparatus of  claim 1 , wherein the radiation source has a dimension about 1 mm. 
     
     
         9 . A light emitting apparatus comprising:
 a first radiation source;   a second radiation source having a dimension smaller than that of the first radiation source;   an optic device comprising a top surface distal the radiation sources, a bottom surface proximal the radiation sources, and a transparent sidewall extending between the top surface and the bottom surface; and   a down conversion material disposed adjacent to or on the top surface and extending from the transparent sidewall.   
     
     
         10 . The light emitting apparatus of  claim 9 , further comprising an aperture between the optic device and the radiation sources. 
     
     
         11 . The light emitting apparatus of  claim 9 , further comprising a sealant between the optic device and the radiation sources. 
     
     
         12 . The light emitting apparatus of  claim 9 , wherein one of the first radiation source and the second radiation source has a dimension about 1 mm. 
     
     
         13 . The light emitting apparatus of  claim 9 , wherein at least one of the first radiation source and the second radiation source is not encapsulated by a dome. 
     
     
         14 . The light emitting apparatus of  claim 9 , wherein the bottom surface has a width smaller than that of the top surface. 
     
     
         15 . The light emitting apparatus of  claim 9 , wherein the down conversion material comprises a single phosphor or multiple phosphors. 
     
     
         16 . A light emitting apparatus comprising:
 a first radiation source without a dome;   an optic device having a height smaller than 20 mm, and comprising a top surface distal the first radiation source, a bottom surface proximal the first radiation sources, and a transparent sidewall extending between the top surface and the bottom surface;   a lens; and   a down conversion material between the lens and the radiation source.   
     
     
         17 . The light emitting apparatus of  claim 16 , further comprising a second radiation source having a dimension smaller than that of the first radiation source. 
     
     
         18 . The light emitting apparatus of  claim 16 , further comprising a sealant between the optic device and the first radiation source. 
     
     
         19 . The light emitting apparatus of  claim 16 , wherein the bottom surface has a width smaller than that of the top surface. 
     
     
         20 . The light emitting apparatus of  claim 16 , wherein the transparent sidewall comprises a straight portion, a curved portion, or both thereof.