Semiconductor light source apparatus

A semiconductor light source apparatus, comprising:

• a radiating substrate having a mounting surface and a bottom surface located in an opposite direction of the mounting surface;
• a phosphor layer having a top surface and a bottom surface being composed of at least one of a glass phosphor and a phosphor ceramic, and the top surface of the phosphor layer including a light incident region;
• a reflective layer having a top surface and a bottom surface being composed of at least one of a metallic reflective layer and an dielectric multi-layer, the top surface of the reflective layer directly contacting with the bottom surface of the phosphor layer, the bottom surface of the reflective layer including a heat-radiating region, the heat-radiating region of the bottom surface of the reflective layer being located substantially under the light incident region of the top surface of the phosphor layer;
• a plurality of metallic bumps being located between the mounting surface of the radiating substrate and the bottom surface of the reflective layer including the heat-radiating region, and thereby the phosphor layer being attached to the radiating substrate via the reflective layer;
• and
• a semiconductor light source having an optical axis and a light-emitting area, the semiconductor light source located adjacent to the phosphor layer, the optical axis of the semiconductor light source intersecting with the light incident region of the top surface of the phosphor layer at an angle between 0 degrees and 90 degrees, the light-emitting area of the semiconductor light source substantially corresponding to the light incident region on the top surface of the phosphor layer to wavelength-convert light emitted from the semiconductor light source by the phosphor layer, and wherein the semiconductor light source apparatus is configured such that light emitted from the semiconductor light source travelling along the optical axis changes direction toward the phosphor layer after being reflected from the reflective layer.