Phosphor wheel and illumination device comprising this phosphor wheel and a pump light source

摘要

The invention provides an illumination device comprising a pump light source and a phosphor wheel. The phosphor wheel comprises at least two segmented phosphor layers. The front surfaces of the phosphor layers do not form a common plane, but instead a kind of relief in which the surfaces of the phosphor layers extend in different imaginary planes. When the phosphor wheel rotates through a beam waist of the pump. light, in this way the size of the pump light spot and therefore also the power density distribution of the pump light on the respective phosphor layer are adapted.

主权项

1. A phosphor wheel for an illumination device, for converting pump light into conversion light, which is configured for rotation about a rotation axis, having a carrier substrate and at least two phosphor regions arranged thereon,
wherein a first phosphor region comprises a first phosphor layer comprising a first phosphor for emitting conversion light of a first light color, wherein a second phosphor region comprises a second phosphor layer comprising a second phosphor for emitting conversion light of a second light color, wherein a front surface, arranged for exposure to the pump light, of the first phosphor layer is configured in a planar fashion in such a way that the front surface of the first phosphor layer lies in a first imaginary plane, wherein a front surface, arranged for exposure to the pump light, of the second phosphor layer is configured in a planar fashion in such a way that the front surface of the second phosphor layer lies in a second imaginary plane, and wherein the first imaginary plane and the second imaginary plane are parallel to one another and are separated from one another by a non-zero distance D.