| abstract |
The present invention relates to a wavelength converter, to a light-emitting device that uses the wavelength converter, and to a production method for the wavelength converter. The wavelength converter is provided with a light-transmitting substrate (20) and with a thin film (22) that is formed on a surface (20a) of the light-transmitting substrate (20) and that contains a phosphor. A sintered body that constitutes the light-transmitting substrate (20) has an average particle size of 5-40 μm. The light-transmitting substrate (20) contains at least 10-500 ppm by mass of MgO. The principal component of the phosphor is an α-sialon that is indicated by the general formula (Caα,Euβ)(Si,Al) 12 (O,N) 16 (provided that 1.5 < α+β < 2.2, 0 < β < 0.2, and O/N ≤ 0.04). |