LIGHT-EMITTING DEVICE AND PROJECTION SYSTEM

摘要

A light-emitting device comprises a first wavelength conversion material layer (104) for absorbing excitation light (101) and emitting hybrid excited light (103) and an optical film (105). The first wavelength conversion material layer has a first surface (104a) and a second surface (104b) opposite to each other, the first surface being used for receiving the excitation light. The first wavelength conversion material layer comprises a first wavelength conversion material (203) for absorbing the excitation light and generating first excited light, and a second wavelength conversion material (204) for absorbing at least part of the first excited light and generating second excited light. The energy conversion efficiency of the first wavelength conversion material is higher than that of the second wavelength conversion material. The optical film is located at a side close to the second surface of the first wavelength conversion material layer, and is used for reflecting the first excited light and the second excited light from the first wavelength conversion material layer. Further disclosed is a projection system comprising the light-emitting system. Compared with use of the first wavelength conversion material or the second wavelength conversion material alone, the light-emitting device disclosed by the present invention can obtain a higher luminous flux of monochromatic light.