Wide color gamut light-emitting element

Abstract

A light emitting device including a housing including walls defining a cavity having one side thereof opened, a light emitter to emit light having a peak wavelength in a blue wavelength band and including first and second light emitting chips, a reflective region in the housing to reflect light, and a wavelength conversion layer disposed on the light emitter and including a first wavelength converter and a second wavelength converter to emit light having different peak wavelengths from each other, in which the first wavelength converter has a first excitation peak wavelength and the second wavelength converter has a second excitation peak wavelength, and the second wavelength converter includes a fluoride-based red phosphor represented by A2MF6:Mn4+, where A is one of Li, Na, K, Ba, Rb, Cs, Mg, Ca, Se, and Zn, and M is one of Ti, Si, Zr, Sn, and Ge.

What is claimed is: 
     
         1 . A light emitting device comprising:
 a housing including a plurality of walls defining a cavity having one side thereof opened;   a light emitter disposed in the cavity and configured to emit light having a peak wavelength in a blue wavelength band, the light emitter including a first light emitting chip and a second light emitting chip spaced apart from each other;   a reflective region disposed in the housing and configured to reflect light emitted from the light emitter; and   a wavelength conversion layer disposed on the light emitter and including a first wavelength converter and a second wavelength converter configured to emit light having different peak wavelengths from each other,   wherein the first wavelength converter has a first excitation peak wavelength and the second wavelength converter has a second excitation peak wavelength different from the first excitation peak wavelength, and   wherein the second wavelength converter comprises a fluoride-based red phosphor is represented by A 2 MF 6 :Mn 4+ , wherein A is one of Li, Na, K, Ba, Rb, Cs, Mg, Ca, Se, and Zn, and M is one of Ti, Si, Zr, Sn, and Ge.   
     
     
         2 . The light emitting device of  claim 1 , wherein the first excitation peak wavelength is less than the second excitation peak wavelength. 
     
     
         3 . The light emitting device of  claim 1 , wherein the second excitation peak wavelength is about 450 nm. 
     
     
         4 . The light emitting device of  claim 1 , wherein the first wavelength converter is configured to convert a primary light emitted from the light emitter to a secondary light having a peak wavelength in a green wavelength band. 
     
     
         5 . The light emitting device of  claim 1 , wherein the second wavelength converter is configured to convert a primary light emitted from the light emitter to a third light having a peak wavelength in a red wavelength band. 
     
     
         6 . The light emitting device of  claim 1 , wherein the second wavelength converter is disposed on the light emitter and disposed on a different region of the housing with respect to the first wavelength converter. 
     
     
         7 . The light emitting device of  claim 6 , wherein at least a region of the second wavelength converter directly contacts the first wavelength converter. 
     
     
         8 . The light emitting device of  claim 1 , wherein the housing has a white color and comprises an opaque silicone resin including a mixture of phenyl silicone resin and a methyl silicon resin. 
     
     
         9 . The light emitting device of  claim 1 , wherein light emitted from the light emitting device is a combination of light emitted from the first and second light emitting chips, light emitted from the first wavelength converter, and light emitted from the second wavelength converter. 
     
     
         10 . The light emitting device of  claim 9 ,wherein the light emitted from the light emitting device has a color coordinate that is disposed in a triangle represented by R(x 0.677, y 0.3), G(x 0.151, y 0.737), and B(x 0.154, y 0.047) in the CIE xy coordinate system. 
     
     
         11 . A light emitting device comprising:
 a housing including a plurality of walls defining a cavity having one side thereof opened;   a light emitter disposed in the cavity and configured to emit light having a peak wavelength in a blue wavelength band;   a reflective region disposed in the housing and configured to reflect light emitted from the light emitter; and   a wavelength conversion layer disposed on the light emitter and including a first wavelength converter and a second wavelength converter configured to emit light having different peak wavelengths from each other,   wherein the first wavelength converter has a first excitation peak wavelength and the second wavelength converter has a second excitation peak wavelength different from the first excitation peak wavelength, and   wherein the light emitting device is configured to emit light having a color coordinate that is disposed in a triangle represented by R(x 0.677, y 0.3), G(x 0.151, y 0.737) and B(x 0.154, y 0.047) in the CIE xy coordinate system.   
     
     
         12 . The light emitting device of  claim 11 , wherein the second wavelength converter is disposed on the light emitter, and the first excitation peak wavelength is less than the second excitation peak wavelength. 
     
     
         13 . The light emitting device of  claim 12 , wherein the second wavelength converter has a region directly contacting the first wavelength converter. 
     
     
         14 . The light emitting device of  claim 13 , wherein the second wavelength converter has a region directly contacting the light emitter. 
     
     
         15 . The light emitting device of  claim 11 , wherein light emitted from the light emitting device is a combination of light emitted from the light emitter, light emitted from the first wavelength converter, and light emitted from the second wavelength converter. 
     
     
         16 . The light emitting device of  claim 11 , wherein the second wavelength converter comprises a fluoride-based red phosphor represented by A 2 MF 6 :Mn 4+ , wherein A is one of Li, Na, K, Ba, Rb, Cs, Mg, Ca, Se, and Zn, and M is one of Ti, Si, Zr, Sn, and Ge. 
     
     
         17 . A light emitting device comprising:
 a housing including a plurality of walls defining a cavity having one side thereof opened;   a light emitter disposed in the cavity and configured to emit light having a peak wavelength in a blue wavelength band;   a reflective region disposed in the housing and configured to reflect light emitted from the light emitter; and   a wavelength conversion layer disposed on the light emitter and including a first wavelength converter and a second wavelength converter configured to emit light having different peak wavelengths from each other,   wherein the first wavelength converter has a first excitation peak wavelength and the second wavelength converter has a second excitation peak wavelength different from the first excitation peak wavelength, and   wherein the second wavelength converter includes a first region and a second region, the first region directly contacting the first wavelength converter, and the second region directly contacting the light emitter and having a less thickness than the first region.   
     
     
         18 . The light emitting device of  claim 17 , wherein light emitted from the light emitting device is a combination of light emitted from the light emitter, light emitted from the first wavelength converter, and light emitted from the second wavelength converter. 
     
     
         19 . The light emitting device of  claim 18 , wherein the light emitted from the light emitting device comprises a color coordinate that is disposed in a triangle represented by R(x 0.677, y 0.3), G(x 0.151, y 0.737) and B(x 0.154, y 0.047) in the CIE xy coordinate system. 
     
     
         20 . The light emitting device of  claim 17 , wherein the housing has a white color and comprises an opaque silicone resin including a mixture of phenyl silicone resin and a methyl silicone resin.