WHITE LIGHT EMITTING DEVICE AND WHITE LIGHT SOURCE MODULE USING THE SAME

摘要

PURPOSE: A white light emitting device and a white light source module using the same are provided to obtain high color uniformity and reproduction using a blue LED chip, a red phosphor, and a green phosphor. CONSTITUTION: A white light source device(510) comprises a blue LED chip(103) and at least one phosphor(105,107). The blue LED chip has a dominant wavelength of 443 to 455 nm. The main dominant wavelength is the wavelength obtained from a curve by integrating a visibility curve and an emitted light spectrum graph measured by equipment in consideration of the visibility of a person. The dominant wavelength corresponds to the wavelength value at a point where a line to connect a color coordinate value measured by equipment and a central value(0.333,0.333) of CIE 1976 color coordinate system meets an outer line of CIE 1976 chromaticity diagram. A red color coordinate of the phosphor emits light with the color coordinate inside a square composed of (0.5448,0.4544), (0.7079,0.2920), (0.6427,0.2905) and (0.4794,0.4633). A green color coordinate emits light with the color coordinate inside a square composed of (0.1270,0.8037), (0.4117,0.5861), (0.4197,0.5316) and (0.2555,0.5030).