| 摘要 |
There are provided a light-emitting element mounting substrate which exhibits high reflectivity, and a light-emitting module having high reliability and high luminance. A light-emitting element mounting substrate includes an alumina sintered body containing alumina crystal, zirconia crystal, and grain boundary phase, wherein an intensity ratio I t /I m between a peak intensity It of tetragonal zirconia crystal at 2¸ ranging from 30° to 30.5° and a peak intensity I m of monoclinic zirconia crystal at 2¸ ranging from 28° to 28.5° measured by X-ray diffractometer using Cu-K± radiation, is less than or equal to 35 excluding 0. Further, a light-emitting element module includes the light-emitting element mounting substrate, and a light-emitting element mounted thereon. |
