Wavelength conversion device, phosphor wheel, light source device, projection display apparatus, and method for manufacturing wavelength conversion device

A light source device comprising:

• a phosphor wheel including a wavelength conversion device and a motor;
• and
• a light source that emits laser light as a first light,
• wherein the wavelength conversion device includes:
• a wavelength conversion element that generates, from the first light incident on the wavelength conversion element, second light having a wavelength different from a wavelength of the first light and third light having a wavelength different from the wavelength of the first light and the wavelength of the second light;
• and
• a substrate on which the wavelength conversion element is disposed,
• wherein the motor rotationally drives the substrate,
• wherein the wavelength conversion element includes a plurality of wavelength converters arranged adjacent to each other in a first direction intersecting an incident direction in which the first light is incident,
• each of the plurality of wavelength converters includes:
• a first phosphor layer that converts the first light into fluorescent light that is the second light;
• and
• a second phosphor layer that converts the first light into fluorescent light that is the third light,
• wherein the first phosphor layer and the second phosphor layer are arranged adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers included in the plurality of wavelength converters are alternately arranged in the first direction,
• the first direction is a direction along a surface of the substrate,
• the substrate has a disk shape,
• the plurality of wavelength converters are disposed adjacent to each other in a radial direction of the substrate,
• the first phosphor layers and the second phosphor layers are disposed adjacent to each other such that the plurality of first phosphor layers and the plurality of second phosphor layers are alternately arranged in the radial direction of the substrate, and
• a width of a spot of the first light incident on the wavelength conversion device from the light source in the radial direction is equal to an integral multiple of a width of each of the plurality of wavelength converters in the radial direction.