Patent ID: 7999456
Filing Date: 2011-08-16
Classification: C09K,H01L,H05B,Y02B

Abstract:
1. A white light emitting diode (LED) comprising: a blue LED chip; and yellow, green, and red light emitting phosphors that are coated on the blue LED chip at a predetermined mixing ratio and converts light, emitted from the blue LED chip, into white light; wherein the yellow light emitting phosphor is a silicate-based phosphor, wherein the green light emitting phosphor is a silicate-based phosphor composed of (Ba, Sr, Ca, Mg)2SiO4:Eu, Re or a sulfide-based phosphor composed of (Sr, Ca)Ga2S4:Eu, Re wherein the red light emitting phosphor is a nitride-based phosphor composed of Sr, Ca, Ba)AlSiN:Eu, Re wherein the Eu represents a basic doping, Re represents rare earth co-doping and the mixing ratio of the yellow, green, and red light emitting phosphors is set in the range of: 0.5≦yellow light emitting phosphors <1, 0.01≦green light emitting phosphors ≦0.04, and 0.01<red light emitting phosphors ≦0.1 (here, yellow light emitting phosphors+green light emitting phosphors+red light emitting phosphors=1).