WHITE LED DEVICE AND LIGHT SOURCE MODULE FOR LCD BACKLIGHT USING THE SAME

摘要

A white light emitting device including: a blue LE chip having a dominant wavelength of 430 to 455 nm; a red phosphor disposed around the blue light emitting diode chip, the red phosphor excited by the blue light emitting diode chip to emit red light; and a green phosphor disposed around the blue light emitting diode chip, the green phosphor excited by the blue LED chip to emit green light, wherein the red light emitted from the red phosphor has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633) based on the CIE 1931 chromaticity diagram, the green light emitted from the green phosphor has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram, and the red phosphor includes a phosphor represented by (Sr, Ba, Ca)AlSiNSUB3/SUB:Eu and the green phosphor includes a phosphor represented by (Sr, Ba, Ca)SUB2/SUBSiOSUB4/SUB:Eu.