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US 11,112,086 B2Granted
Phosphor element and lighting device
AssigneeNGK Insulators, Ltd.
InventorsNaotake Okada, Iwao Ohwada, Shoichiro Yamaguchi, Keiichiro Asai, Jungo Kondo
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Abstract
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.
Claims5
A phosphor device comprising:
- a phosphor layer;
- a reflective film provided on said phosphor layer, said reflective film comprising a ferroelectric multi-layered film;
- a warping suppression layer provided on and directly contacting said reflective film, said warping suppression layer comprising a material selected from Al2O3, SiC, ZrO2, AlN, Nb, Ta, Mo and W;
- and
- a supporting body bonded to said warping suppression layer by direct bonding, wherein
- a thermal expansion coefficient of a material of said warping suppression layer is larger than the largest thermal expansion coefficients of materials forming said ferroelectric multi-layered film,
- an excitation light incident onto said phosphor layer is converted to a fluorescence, and
- said fluorescence and said excitation light are reflected by said reflective film and emitted from said phosphor layer.
5 more elements
Dependencies are inferred from the claim text.