| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a yellow light component in irradiation light and also obtain a sufficient light flux, in a white light emitting device using an LED. <P>SOLUTION: A white light emitting device 1 includes: an LED 21; an optical filter 5 provided on a light emitting surface side of the LED 21 and reducing transmission of light having a specific wavelength; and a wavelength conversion member 6 provided between the LED 21 and the optical filter 5. The wavelength conversion member 6 includes: a first phosphor 61 converting light emitted from the LED 21 into light having a peak at a wavelength of 630-680 nm; and a second phosphor 62 converting the light emitted from the LED 21 into light having a peak at a wavelength of 500-550 nm. The wavelength conversion member 6 is configured such that light intensities radiated from the first phosphor 61 and the second phosphor 62 are at a similar level with each other. The optical filter 5 reduces transmission of light having a wavelength of 560-620 nm. With the constitution, a yellow light component included in irradiation light is little, so that lowering of a light flux can be suppressed even when an optical filter restricting the transmission of light in the wavelength region is used. <P>COPYRIGHT: (C)2013,JPO&INPIT |
