Patent ID: 9605832
Date: 2017-03-28
CPC Classifications: C09K,F21V,F21Y,H01L,H05B

Claim:
1. A phosphor optical element comprising: a base member; a phosphor-containing member that includes a transparent member containing a phosphor particle; and a cover member, wherein the base member, the phosphor-containing member, and the cover member are sequentially formed on a transparent base that is transparent to a wavelength of incident light from an excitation light source, the base member is a dielectric multilayer film whose layers are stacked in a direction perpendicular to the transparent base, the phosphor-containing member is in direct contact with the dielectric multilayer film, the phosphor particle has a diameter no greater than the wavelength of the incident light, and in an arbitrary cross section of the phosphor-containing member in a direction perpendicular to a main surface of the transparent base, the phosphor-containing member has, in at least one of (i) a direction perpendicular to and (ii) a direction horizontal to the main surface of the transparent base, a thickness no greater than the wavelength of the incident light.