Patent ID: 10508801

Abstract:
The invention provides a fluorescent member which has high thermal conductivity and thus can prevent an increase in temperature of a phosphor layer and can maintain fluorescent performance even when irradiated with source light having a high intensity, and provides a light-emitting device having such a member. A reflection-type wavelength converting member 100 converts light with a specific wavelength to light with other wavelength and also reflects the light on a reflection surface to emit the light as illumination light. The wavelength converting member 100 includes a substrate 110 including an inorganic material, and a phosphor layer 120 disposed on the substrate 110 and including phosphor particles 122 that absorb light and emit converted light and a translucent ceramic 121 that binds the phosphor particles 122 to one another. The ratio of the thickness of the phosphor layer 120 to the average particle size of the phosphor particles 122 is less than 30. The reflection surface on which the converted light is reflected is a surface of the substrate 110 or a surface of a reflector adjacent to the wavelength converting member.