US Patent 11112086 Phosphor element and lighting device

A phosphor device includes a phosphor layer composed of a phosphor glass or phosphor single crystal, a reflective film provided on the phosphor layer, a warping suppression layer provided on the reflective film, and a supporting body bonded to the warping suppression layer by direct bonding. An excitation light incident into the phosphor layer is converted to fluorescence, and the fluorescence and excitation light are reflected by the reflective film and emitted from the phosphor layer.