Patent ID: 8829778
Filing Date: 2014-09-09
Classification: C09K,H01L,Y02B

Abstract:
1. A white light-emitting unit which emits white light containing a blue light component, a green light component, and a red light component, wherein the blue light component includes light having any wavelength in the range of 440-480 nm, the green light component includes light having any wavelength in the range of 515-560 nm, and the red light component includes light having any wavelength in the range of 615-645 nm, the white light-emitting unit comprises: a light-emitting semiconductor element that emits light including the blue light component, a first phosphor that absorbs the light emitted by the light-emitting semiconductor element and emits, through wavelength conversion, light including the green light component, and a second phosphor that absorbs the light emitted by the light-emitting semiconductor element and emits, through wavelength conversion, light including the red light component, a weight ratio of the second phosphor to the first phosphor is in a range of 0.39 to 1.23, the first phosphor does not comprise Ba the white light has a spectrum which has a maximum wavelength in the range of 615-645 nm, and an intensity at a wavelength of 580 nm of the spectrum of the white light which has been normalized with respect to luminous flux is 80-100% of an intensity at a wavelength of 580 nm of the spectrum of standard light for color rendering evaluation which has been normalized with respect to luminous flux.