Wavelength conversion element and light source module and projection display device

A light source module comprising:

• a light source section;
• and
• a wavelength conversion element that is excited by excitation light from the light source section to emit fluorescent light, wherein
• the wavelength conversion element includes
• a phosphor layer including a plurality of phosphor particles, the phosphor layer having a gap therein,
• a refrigerant that cools the phosphor layer,
• a refrigerant transport member provided in contact with the phosphor layer, the refrigerant transport member circulating the refrigerant, and
• a housing in which the phosphor layer, the refrigerant, and the refrigerant transport member are encapsulated.

A projection display device comprising:

• a light source module;
• a light modulation element that modulates light emitted from the light source module;
• and
• a projection optical system that projects light from the light modulation element, wherein
• the light source module includes
• a light source section, and
• a wavelength conversion element that is excited by excitation light from the light source section to emit fluorescent light, and
• the wavelength conversion element includes
• a phosphor layer including a plurality of phosphor particles, the phosphor layer having a gap therein,
• a refrigerant that cools the phosphor layer,
• a refrigerant transport member provided in contact with the phosphor layer, the refrigerant transport member circulating the refrigerant, and
• a housing in which the phosphor layer, the refrigerant, and the refrigerant transport member are encapsulated.