Illumination device

Abstract

Embodiments of the invention include a semiconductor light emitting device for emitting a first light at a first wavelength and a wavelength conversion medium arranged to convert at least part of the first light into a second light at a second wavelength. The wavelength conversion medium is disposed between a periodic antenna array and the semiconductor light emitting device. The periodic antenna array includes a plurality of antennas. The periodic antenna array supports surface lattice resonances arising from diffractive coupling of localized surface plasmon resonances in at least one of the antennas.

1 . A device comprising:
 a light source, for generating light source light; and   a luminescent material, for converting at least part of the light source light into luminescent material light, wherein the luminescent material comprises hexagonal phase (K 1-r-l-n-c-nh Rb r Li l N n Cs c (NH 4 ) nh ) 2 Si 1-m-t-g-s-zr Mn m Ti t Ge g Sn s Zr zr (F 1-cl-b-i Cl cl Br b I i ) 6 , wherein m is in the range of 0.001-0.15, wherein t, g, s, and zr are each individually in the range of 0-0.2, with t+g+s+zr is greater than 0 and equal to or smaller than 0.2, wherein r is in the range of 0.2-0.8, wherein 1, n, c, and nh are each individually in the range of 0-0.2, with l+n+c+nh greater than 0 and equal to or smaller than 0.2, wherein cl, b, and i are each individually in the range of 0-0.2, with cl+b+i greater than 0 and equal to or smaller than 0.2;   wherein the luminescent material is in direct contact with the light source.   
     
     
         2 . The device of  claim 1  further comprising a transmissive dome disposed over the luminescent material. 
     
     
         3 . The device of  claim 1 , further comprising a transmissive coating disposed over the luminescent material. 
     
     
         4 . The device of  claim 3 , wherein the transmissive coating is selected from the group consisting of a polymeric layer, a silicone layer, an epoxy layer, silicon dioxide, and silicon nitride. 
     
     
         5 . The device of  claim 1  wherein the luminescent material further comprises M 3 A 5 O 12 :Ce 3+ , wherein M is selected from the group consisting of Sc, Y, Tb, Gd, and Lu, and wherein A is selected from the group consisting of Al and Ga. 
     
     
         6 . The device of  claim 1  wherein the luminescent material further comprises M 2 Si 5 N 8 :Eu 2+ , wherein M is selected from the group consisting of Ca, Sr, and Ba. 
     
     
         7 . The device of  claim 1  wherein the light source light comprises UV light, the luminescent material further comprising BaMgAl 10 O 17 :Eu 2+ . 
     
     
         8 . The device of  claim 1  wherein a combination of the light source light and the luminescent material light has a correlated color temperature between 2000 and 20000K. 
     
     
         9 . The device of  claim 1  wherein a combination of the light source light and the luminescent material light is within 15 standard deviation of color matching from the black body locus. 
     
     
         10 . A device comprising:
 a light source, for generating light source light; and   a luminescent material, for converting at least part of the light source light into luminescent material light, wherein the luminescent material comprises hexagonal phase (K 1-r-l-n-c-nh Rb r Li l Na n Cs c (NH 4 ) nh ) 2 Si 1-m-t-g-s-zr Mn m Ti t Ge g Sn s Zr zr (F 1-cl-b-i Cl cl Br b I i ) 6 , wherein m is in the range of 0.001-0.15, wherein t, g, s, and zr are each individually in the range of 0-0.2, with t+g+s+zr is greater than 0 and equal to or smaller than 0.2, wherein r is in the range of 0.2-0.8, wherein 1, n, c, and nh are each individually in the range of 0-0.2, with l+n+c+nh greater than 0 and equal to or smaller than 0.2, wherein cl, b, and i are each individually in the range of 0-0.2, with cl+b+i greater than 0 and equal to or smaller than 0.2;   wherein the luminescent material is spaced apart from the light source.   
     
     
         11 . The device of  claim 10  wherein the light source is disposed in a chamber with reflective walls. 
     
     
         12 . The device of  claim 10  wherein the luminescent material is disposed on a transparent window. 
     
     
         13 . The device of  claim 10  wherein the luminescent material is disposed on both sides of a transparent window. 
     
     
         14 . The device of  claim 10  wherein the luminescent material is spaced between 0.1 mm and 10 cm from the light source. 
     
     
         15 . The device of  claim 10  wherein the luminescent material further comprises M 3 A 5 O 12 :Ce 3+ , wherein M is selected from the group consisting of Sc, Y, Tb, Gd, and Lu, and wherein A is selected from the group consisting of Al and Ga. 
     
     
         16 . The device of  claim 10  wherein the luminescent material further comprises M 2 Si 5 N 8 :Eu 2+ , wherein M is selected from the group consisting of Ca, Sr, and Ba. 
     
     
         17 . The device of  claim 10  wherein the light source light comprises UV light, the luminescent material further comprising BaMgAl 10 O 17 :Eu 2+ . 
     
     
         18 . The device of  claim 10  wherein a combination of the light source light and the luminescent material light has a correlated color temperature between 2000 and 20000K. 
     
     
         19 . The device of  claim 10  wherein a combination of the light source light and the luminescent material light is within 15 standard deviation of color matching from the black body locus. 
     
     
         20 . A device comprising:
 a light source, for generating light source light; and   a luminescent material, for converting at least part of the light source light into luminescent material light;   wherein the light source comprises a light emitting diode (LED);   wherein the luminescent material comprises a phosphor comprising M 2 AX 6  doped with tetravalent manganese, wherein M comprises monovalent cations, at least comprising potassium and rubidium, wherein A comprises a tetravalent cation, at least comprising silicon, wherein X comprises a monovalent anion, at least comprising fluorine, wherein M 2 AX 6  has the hexagonal phase, and wherein M 2 AX 6  has a luminous efficacy greater than 200 lm/W; and   wherein the luminescent material is spaced apart from the light source.