LIGHT-EMITTING DEVICE MOUNTING CERAMIC SUBSTRATE AND LIGHT-EMITTING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting device mounting ceramic substrate and a light-emitting apparatus having a high light reflectance in a near-ultraviolet light region.SOLUTION: The light-emitting device mounting ceramic substrate A comprises an alumina crystal particle 1-based ceramic sintered body including zirconia crystal particles 3. The alumina crystal particles 1 have nearly parallel opposite faces. The alumina crystal particles 1 including the zirconia crystal particles 3 exist 60% or more by number percentage in the ceramic sintered body. The zirconia crystal particles 3 are mixed crystals of monoclinic zirconia with at least one of tetragonal zirconia and cubic zirconia.