Photoconversion device and illumination system

A photoconversion device, comprising:

• a first wavelength converter configured to receive excitation light from an output portion and emit fluorescence having a longer wavelength than the excitation light;
• a long-pass filter configured to transmit the fluorescence emitted by the first wavelength converter and reflect the excitation light transmitted through or reflected from the first wavelength converter to enter the first wavelength converter;
• a reflective member;
• and
• a second wavelength converter on a surface of the reflective member away from the first wavelength converter, the second wavelength converter being configured to receive the excitation light reflected from the long-pass filter and emit fluorescence having a longer wavelength than the reflected excitation light,
• wherein the first wavelength converter includes a front surface to receive the excitation light from the output portion and a back surface opposite to the front surface, and
• the reflective member is in contact with the back surface.