| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED light emitting device improving such a problem that, in a light emitting device including phosphors of a plurality of colors, fluorescence on a short wavelength side, such as blue and green, is easily reabsorbed by a phosphor on a long wavelength side, thereby causing a deterioration in light extraction efficiency.SOLUTION: In an LED light emitting device, each of light emitting parts of a plurality of colors comprises an LED element 1 and a phosphor layer 17 or 19. The phosphor layers 17 and 19 are formed of resins containing phosphors 12 and 14, respectively, which absorb light emitted from the LED element 1 as excitation light to convert the wavelength thereof. A light emitting part having the phosphor layer 19 on a long wavelength side among the light emitting parts of a plurality of colors has an optical film layer 34, and the optical film layer 34 is formed of a dielectric multilayer film so as to selectively reflect fluorescence G on a short wavelength side. Thus, in the LED light emitting device, the arrangement of light emitting parts is free, and the fluorescence G can be suppressed from being reabsorbed, so that white light capable of achieving high luminosity as well as excellent color rendering properties can be obtained. |
