Glass ceramic body, substrate for mounting light emitting element, and light emitting device

Abstract

To provide a glass ceramic body, whereby light which transmits through the substrate and leaks (i.e. emits) out of the incident direction is reduced, and the number of voids at the surface of the substrate and in the inside of the substrate is low, A glass ceramic body 10 comprising a glass matrix 11 and flat fillers 12 dispersed therein, wherein the flat fillers 12 are dispersed in the glass matrix 11 so that their individual thickness directions would be substantially in the same direction; and in a cross-section along the thickness direction of the flat filler 12 in the glass matrix 11, the occupation area of the flat fillers 12 having a length in their flat direction of from 0.5 to 20 μm and a length in their thickness direction of from 0.02 to 0.25 μm per unit area of the cross-section is from 30 to 48%.

Dependencies are inferred from the claim text.