Patent ID: 9551474
Date: 2017-01-24
CPC Classifications: F21K,F21S,F21V,F21Y,H01L,H01S

Claim:
1. A wavelength conversion member comprising: a heat conducting layer having a first surface and a second surface opposite to the first surface; a sapphire substrate having a third surface and a fourth surface opposite to the third surface, the third surface being in direct contact with the second surface of the heat conducting layer; and a phosphor layer having a fifth surface and a sixth surface opposite to the fifth surface, the fifth surface being in direct contact with the fourth surface of the sapphire substrate, the phosphor layer including phosphor that converts first light having a first wavelength into second light having a second wavelength longer than the first wavelength, wherein: at least one of an area of the first surface and an area of the second surface of the heat conducting layer is at least 2800 times as large as an area of the sixth surface of the phosphor layer, and at least one of an area of the third surface and an area of the fourth surface of the sapphire substrate is at least two times as large as the area of the sixth surface of the phosphor layer.