Patent ID: 8979318
Filing Date: 2015-03-17
Classification: C09K,H01L,H05B

Abstract:
1. A light source having a low color temperature, comprising: a primary radiation source which emits in a blue spectral range; and a layer of two phosphors connected upstream of the primary radiation source, both phosphors partially converting primary radiation from the primary radiation source, wherein a first phosphor of the two phosphors originates from a class of green-emitting chlorosilicates, doped with europium, resulting in an empirical formula Ca wherein the first phosphor has a peak emission in a range from 500 nm to 520 nm, and the second phosphor absorbs at least a short wavelength component of radiation emitted by the first phosphor and absorbs this component to a greater extent than a longer wavelength component of the radiation emitted by the first phosphor, thereby increasing an effective peak emission of the first phosphor by more than 5 nm.