Lighting device

Abstract

A lighting device includes a substrate, a plurality of first light converting units, and a light source. The light source emits a light passing through the plurality of first light converting units and the substrate to generate a first spectrum including a main peak between 520 nanometers (nm) to 590 nm and a first sub peak between 430 nm to 470 nm, and a first transmittance of the substrate at a wavelength of the main peak is greater than a second transmittance of the substrate at a wavelength of the first sub peak.

What is claimed is: 
     
         1 . A lighting device, comprising:
 a substrate;   a plurality of first light converting units; and   a light source emitting a light passing through the plurality of first light converting units and the substrate to generate a first spectrum comprising a main peak between 520 nanometers (nm) to 590 nm and a first sub peak between 430 nm to 470 nm;   wherein a first transmittance of the substrate at a wavelength of the main peak is greater than a second transmittance of the substrate at a wavelength of the first sub peak.   
     
     
         2 . The lighting device of  claim 1 , wherein a ratio of the second transmittance to the first transmittance is in a range from 72% to 98%. 
     
     
         3 . The lighting device of  claim 1 , wherein the first spectrum further comprises a second sub peak between 470 nm to 510 nm, and the first transmittance is greater than a third transmittance of the substrate at a wavelength of the second sub peak. 
     
     
         4 . The lighting device of  claim 3 , wherein a ratio of the third transmittance to the first transmittance is in a range from 85% to 99%. 
     
     
         5 . The lighting device of  claim 3 , wherein the third transmittance is greater than the second transmittance. 
     
     
         6 . The lighting device of  claim 1 , wherein a green x-coordinate value in a CIE 1931 color gamut of the lighting device is in a range from 0.17 to 0.29. 
     
     
         7 . The lighting device of  claim 1 , wherein a green y-coordinate value in a CIE 1931 color gamut of the lighting device is in a range from 675 to 0.8. 
     
     
         8 . The lighting device of  claim 1 , wherein the plurality of first light converting units are disposed between the substrate and the light source. 
     
     
         9 . The lighting device of  claim 8 , wherein at least one of the plurality of first light converting units comprises a light converting structure and a filter layer. 
     
     
         10 . The lighting device of  claim 9 , wherein the filter layer is disposed between the light converting structure and the substrate. 
     
     
         11 . The lighting device of  claim 1 , further comprising an optical layer, wherein the light source and the substrate are disposed at different sides of the optical layer, and the plurality of first light converting units are disposed in the optical layer. 
     
     
         12 . The lighting device of  claim 1 , wherein at least one of the plurality of first light converting units comprises a plurality of quantum dots, a fluorescent material, or a phosphorescent material. 
     
     
         13 . The lighting device of  claim 1 , wherein the substrate comprises a plurality of metal ions, a plurality of nanoparticles or a yellowing polymer. 
     
     
         14 . The lighting device of  claim 1 , wherein the light source comprises at least one light emitting structure, and the at least one light emitting structure is continuously. 
     
     
         15 . The lighting device of  claim 14 , further comprising a plurality of walls, wherein the plurality of walls are disposed between the at least one light emitting structure and the substrate. 
     
     
         16 . A lighting device, comprising:
 a substrate;   a plurality of second light converting units; and   a light source emitting a light passing through the plurality of second light converting units and the substrate to generate a second spectrum comprising a main peak between 591 nanometers (nm) to 780 nm and a sub peak between 430 nm to 470 nm;   wherein a fourth transmittance of the substrate at a wavelength of the main peak is greater than a fifth transmittance of the substrate at a wavelength of the sub peak.   
     
     
         17 . The lighting device of  claim 16 , wherein a ratio of the fifth transmittance to the fourth transmittance is in a range from 72% to 98%. 
     
     
         18 . The lighting device of  claim 16 , wherein a red x-coordinate value in a CIE 1931 color gamut of the lighting device is in a range from 0.68 to 0.71. 
     
     
         19 . The lighting device of  claim 16 , wherein a red y-coordinate value in a CIE 1931 color gamut of the lighting device is in a range from 0.29 to 0.31. 
     
     
         20 . A lighting device, comprising:
 a substrate;   a plurality of first light converting units; and   a light source emitting a light passing through the plurality of first light converting units and the substrate to generate a first spectrum comprising a main peak between 520 nanometers (nm) to 590 nm and a second sub peak between 470 nm to 510 nm;   wherein a first transmittance of the substrate at a wavelength of the main peak is greater than a third transmittance of the substrate at a wavelength of the second sub peak.