ÉLÉMENT DE CONVERSION DE LONGUEUR D'ONDE, SOURCE DE LUMIÈRE, DISPOSITIF D'ÉCLAIRAGE, ET PROCÉDÉ DE FABRICATION D'UN ÉLÉMENT DE CONVERSION DE LONGUEUR D'ONDE

摘要

A wavelength conversion device of the present disclosure includes a substrate, a phosphor layer that has a matrix containing zinc oxide and phosphor particles embedded in the matrix and that is supported by the substrate, a dielectric layer disposed between the substrate and the phosphor layer, and a protective layer that is disposed between the phosphor layer and the dielectric layer and that has an isoelectric point equal to or larger than 7. A main surface of the substrate includes, for example, first and second regions. The phosphor layer covers, for example, only the first region out of the first and second regions.