Patent ID: 7804239
Filing Date: 2010-09-28
Classification: C09K,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, the green light emitting phosphor is a silicate-based phosphor composed of (Ba, Sr, Ca, Mg) the silicate-based phosphor composed of (Ba, Sr, Ca, Mg) Re (rare earth elements) includes at least one of Y, La, Ce, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, F, Cl, Br, and I, the red light emitting phosphor is a nitride-based phosphor composed of (Sr, Ca, Ba)AlSiNx:Eu, Re (1≦x≦5) or a sulfide-based phosphor composed of (Sr, Ca)S:Eu, Re, the nitride-based phosphor composed of (Sr, Ca, Ba)AlSiNx:Eu, Re (1≦x≦5) includes at least one of Sr, Ca, and Ba, Re includes at least one of Y, La, Ce, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, F, Cl, Br, and I, and the doping level of Re is set in the range of 1 to 50000 ppm.