Glass member

1. A glass member for wavelength conversion in which an inorganic phosphor is dispersed in a glass matrix,

wherein:

the glass matrix comprises a SiO 2 —B 2 O 3 based glass as the glass matrix, and

the SiO 2 —B 2 O 3 based glass comprises, based on a total amount of the SiO 2 —B 2 O 3 based glass: SiO 2 in an amount of 60 to 70 wt %; B 2 O 3 in an amount of 15 to 25 wt %; Al 2 O 3 in an amount of 4 to 10 wt %; MgO and ZnO in a total amount of 0.1 to 0.7 wt %; and other metals or metal oxides in a total amount of 0.01 to 5 wt %; and

the inorganic phosphor is contained in an amount of 25 vol % or more and 35 vol % or less based on a total volume of the glass member and comprises one or more of a phosphor of a garnet-based compound, a phosphor of nitride, or a phosphor of oxynitride, which are larger in refractive index than the SiO 2 —B 2 O 3 based glass.

2. The glass member for wavelength conversion according to claim 1 , wherein a cristobalite ratio in a glass region of the glass member is 1% or less.

3. The glass member for wavelength conversion according to claim 1 ,

wherein a shape of the SiO 2 —B 2 O 3 based glass which has not been subjected to a high temperature heat treatment yet during production of the glass member for wavelength conversion is powdery, and

a maximum particle size (Dmax) thereof is 150 μm or less and an average particle size (D50) thereof is 0.1 μm or more, based on a laser diffraction method.

4. The glass member for wavelength conversion according to claim 2 , wherein a content of the glass region is 60 to 80 wt % in the glass member.

5. The glass member for wavelength conversion according to claim 1 , wherein the phosphor is a phosphor of nitride or a phosphor of oxynitride.

6. The glass member for wavelength conversion according to claim 1 , wherein the nitride is CaAlSiN 3 .

7. The glass member for wavelength conversion according to claim 1 , wherein the oxynitride is α-sialon or β-sialon.