disclosed are a wavelength conversion device , and a light source system and a projection system therefor . the wavelength conversion device comprises a supporting structure and a plurality of wavelength conversion modules arranged together , each wavelength conversion module comprising a ceramic carrier and a phosphor material provided thereon . the supporting structure ensures that the plurality of wavelength conversion modules remain fixed relative to one another . the light source system and the projection system both comprise the present wavelength conversion device . the use of ceramic material as the carrier for the phosphor material enables high temperature resistance , and prevents detachment of the phosphor material due to deformation at high temperatures . in addition , such a modular wavelength conversion device does not crack easily , and has a flexible design and shorter production cycle .