| abstract |
An optical wavelength conversion member according to one aspect of the present invention is composed of a ceramic sintered body composed of Al 2 O 3 crystal particles and crystal particles represented by the chemical formula (Y, A) 3 B 5 O 12 : Ce Polycrystalline as the main component. In this optical wavelength conversion member (Y, A) 3 B 5 O 12: Ce in terms of crystal particles, since the on (Y, A) 3 B 5 O 12: Ce of A, having a (Y, A) 3 B 5 O 12 : The concentration of Ce crystal particles on the surface side is higher than the concentration of (Y, A) 3 B 5 O 12 : The area within the concentration of Ce crystal particles is still higher, so it has a high fluorescence intensity (hence, a high luminous intensity ), and high heat resistance (that is, the characteristic that it is difficult to produce temperature extinction). That is, by forming a structure with different concentrations of A elements on the surface and inside of (Y, A) 3 B 5 O 12 : Ce crystal particles, it is possible to achieve high fluorescence characteristics and high Thermal characteristic ceramic phosphor. |