Patent ID: 9547119
Date: 2017-01-17
CPC Classifications: G02B,H01L

Claim:
1. A color temperature variable light emitter comprising: a first phosphor and a second phosphor, the first phosphor and the second phosphor, when pumped with pump light, being adapted for emitting first phosphor light and second phosphor light, respectively, the first phosphor light having a different wavelength from the second phosphor light; and an exit surface adapted for emitting the color temperature variable light; and a light extraction layer optically coupled to the exit surface; wherein the first phosphor and the second phosphor are stacked in a stacking direction in such a way that: (i) at least part of the first phosphor light and at least part of the second phosphor light are combined in the exit surface and emitted as the color temperature variable light; and (ii) the first phosphor and the second phosphor can be individually pumped by first pump light and second pump light, respectively, the first pump light and the second pump light being incident laterally relative to the stacking direction, and perpendicular to the exit surface; wherein the light extraction layer is configured to direct optical radiation irradiated in the stacking direction toward the exit surface.