Wavelength conversion member and light emitting device
A wavelength conversion member that includes a single crystal phosphor and has a high yield rate is provided. A light emitting unit ( 1 ) is a wavelength conversion member that converts a wavelength of a laser light output from a laser light source and includes a phosphor layer ( 1 a ) formed of a single crystal phosphor. A plane orientation of a principal plane ( 1 b ), which has an area larger than those of divided planes, of the phosphor layer is {111}, and a plane orientation of some divided planes out of the plurality of divided planes is {1-10}.
1. A wavelength conversion member that converts a wavelength of an excitation light output from an excitation light source, the wavelength conversion member comprising:
a phosphor layer formed of a single crystal phosphor, wherein
a plane orientation of an upper plane of the phosphor layer, the upper plane having an area larger than those of side planes, is {111}, and
a plane orientation of some side planes out of the plurality of side planes is {1-10}.
2. The wavelength conversion member according to claim 1 , further comprising:
a transparent layer connected with a bottom plane that faces the upper plane, wherein
the transparent layer is formed of a transparent single crystal, and
a plane of the transparent layer, the plane having a plane orientation of {1-100}, is parallel with a side plane of the phosphor layer, the side plane having a plane orientation of {1-10}.
3. The wavelength conversion member according to claim 1 , wherein
a coating that reflects the excitation light is applied on the upper plane.
4. A light emitting device comprising:
a wavelength conversion member according to claim 1 .
5. A wavelength conversion member that converts a wavelength of an excitation light output from an excitation light source, the wavelength conversion member comprising:
a phosphor layer formed of a single crystal phosphor, wherein
a plane orientation of an upper plane of the phosphor layer, the upper plane having an area larger than those of side planes, is {001}, and
a plane orientation of some side planes out of the plurality of side planes is {110}.
6. The wavelength conversion member according to claim 5 , further comprising:
a transparent layer connected with a bottom plane that faces the upper plane, wherein
the transparent layer is formed of a transparent single crystal, and
a plane of the transparent layer, the plane having a plane orientation of {1-100}, is parallel with a side plane of the phosphor layer, the side plane having a plane orientation of {110}.
7. The wavelength conversion member according to claim 5 , wherein
a coating that reflects the excitation light is applied on the upper plane.
8. A light emitting device comprising:
a wavelength conversion member according to claim 5 .