Phosphor wheel

A phosphor wheel applied to convert a wavelength of a waveband light, the phosphor wheel including:

• a substrate having a first region and a second region, wherein the second region has a plurality of openings;
• a phosphor agent disposed on the first region for converting the wavelength of the waveband light;
• and
• a plurality of vortex generators, each vortex generator includes two symmetric guide vanes, wherein the two symmetric guide vanes are disposed on the second region and projects over a corresponding opening, such that a vortex is generated during a rotation of the substrate to effect a heat exchange through the opening.

A phosphor wheel, including:

• a substrate having an uneven inner ring surface and an even outer ring surface, wherein the substrate is circular and includes concentric regions;
• a phosphor agent disposed on the even outer ring surface;
• and
• a plurality of guide vanes disposed on the uneven inner ring surface, wherein a rotation of the substrate generates a vortex of air flowing via the guide vanes, and every two neighboring guide vanes are symmetric with each other relative to a circumference of the corresponding concentric region.