Led light bulb with controlled color distribution using quantum dots

Abstract

A liquid-cooled LED bulb including a base and a shell connected to the base forming an enclosed volume. The liquid-cooled LED bulb also includes a plurality of LEDs attached to the base and disposed within the shell. The LED bulb also includes a thermally-conductive liquid held within the enclosed volume and a quantum dot material for adjusting the wavelength of light emitted from LED bulb.

1 . A liquid-cooled light-emitting diode (LED) bulb comprising:
 a base;   a shell connected to the base forming an enclosed volume;   a plurality of LEDs attached to the base and disposed within the shell, wherein the plurality of LEDs are configured to emit blue light having a first wavelength of approximately 450 nm at peak intensity;   a thermally-conductive liquid held within the enclosed volume; and   a quantum dot material configured to convert a portion of the blue light emitted by the plurality of LEDs to an emission spectrum having a second wavelength greater than 450 nm at peak intensity.   
     
     
         2 . The liquid-cooled LED bulb of  claim 1 , further comprising a ring structure including the quantum dot material, wherein the ring structure is configured to facilitate a flow of the thermally conductive liquid from the LED mount to an inner surface of the shell, and wherein the flow of thermally conductive liquid is caused, at least in part, by natural convection. 
     
     
         3 . The liquid-cooled LED bulb of  claim 2 , wherein an inside radius of the ring structure is spaced apart from a light-emitting face of at least one of the plurality of LEDs, the distance sufficient to facilitate passive convective flow of the thermally conductive liquid between the ring structure and the at least one LED. 
     
     
         4 . The liquid-cooled LED bulb of  claim 2 , wherein an outside radius of the ring structure is spaced apart from an inner surface of the shell. 
     
     
         5 . The liquid-cooled LED bulb of  claim 1 , wherein the quantum dot material comprises quantum dot crystals having sizes ranging between from 2 to 10 nanometers in diameter. 
     
     
         6 . The liquid-cooled LED bulb of  claim 1 , wherein the quantum dot material is configured to absorb light emitted from the LEDs having a first correlated color temperature (CCT) value to produce an emitted light having an emitted CCT value that is at least 1000° K lower than the first CCT value. 
     
     
         7 . The liquid-cooled LED bulb of  claim 1 , wherein the quantum dot material is configured to absorb light emitted from the LEDs having a first correlated color temperature (CCT) value to produce an emitted light having an emitted CCT value that is at least 5000° K lower than the first CCT value. 
     
     
         8 . The liquid-cooled LED bulb of  claim 2 , wherein the ring structure is a hollow toroid surrounding the plurality of LEDs and the quantum dot material is disposed on an interior surface of the ring structure. 
     
     
         9 . The liquid-cooled LED bulb of  claim 2 , wherein the ring structure is a solid toroid surrounding the plurality of LEDs and the quantum dot material is dispersed in the solid volume of the ring structure. 
     
     
         10 . The liquid-cooled LED bulb of  claim 2 , wherein the ring structure is a solid toroid surrounding the plurality of LEDs and the quantum dot material is disposed on an exterior surface of the ring structure. 
     
     
         11 . A liquid-cooled light-emitting diode (LED) bulb comprising:
 a base;   a shell connected to the base forming an enclosed volume;   a plurality of LEDs attached to the base and disposed within the shell, wherein the plurality of LEDs are configured to emit blue light having a first wavelength of approximately 450 nm at peak intensity;   a thermally-conductive liquid held within the enclosed volume; and   a quantum dot material and one or more phosphor materials configured to convert a portion of the blue light emitted by the plurality of LEDs to an emission spectrum having a second wavelength greater than 450 nm at peak intensity.   
     
     
         12 . The liquid-cooled LED bulb of  claim 11 , wherein the quantum dot material and one or more phosphor materials produce light having a correlated color temperature (CCT) value lower than 3000° K and color rendering index (CRI) value greater than 90. 
     
     
         13 . (canceled) 
     
     
         14 . The liquid-cooled LED bulb of  claim 11 , wherein a phosphor material is also dispersed within the thermally-conductive liquid for adjusting the wavelength of light emitted from the LED bulb. 
     
     
         15 . The liquid-cooled LED bulb of  claim 11 , wherein the thermally conductive liquid is able to facilitate natural convective cooling for the LEDs. 
     
     
         16 . The liquid-cooled LED bulb of  claim 11 , wherein the quantum dot material comprises quantum dot crystals having sizes ranging between from 2 to 10 nanometers in diameter. 
     
     
         17 . (canceled) 
     
     
         18 . The liquid-cooled LED bulb of  claim 11 , wherein the quantum dot material is configured to absorb light emitted from the LEDs having a first correlated color temperature (CCT) value to produce an emitted light having an emitted CCT value that is at least 1000° K lower than the first CCT value. 
     
     
         19 . The liquid-cooled LED bulb of  claim 11 , wherein the quantum dot material is configured to absorb light emitted from the LEDs having a first correlated color temperature (CCT) value to produce an emitted light having an emitted CCT value that is at least 5000° K lower than the first CCT value. 
     
     
         20 . The liquid-cooled LED bulb of  claim 11 , wherein the quantum dot material and one or more phosphor materials produce light having a correlated color temperature (CCT) value less than 3000° K and color rendering index (CRI) value greater than 90.