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CERAMICS SUBSTRATE FOR MOUNTING LIGHT-EMITTING ELEMENT AND LIGHT- EMITTING DEVICE
There is provided a ceramics substrate for mounting a light-emitting element having high thermal conductivity which can achieve high reflectance and which can enhance heat dissipation performance to extend the lifetime of a light-emitting element. A ceramics substrate for mounting a light-emitting element includes a ceramic sintered body, the ceramic sintered body having a mounting section on which a light-emitting element is mounted, in a surface portion on a mounting section side of the ceramic sintered body, a ratio of crystal grains having a crystal grain size of 0.2 µm to 1.0 µm in equivalent circle diameter being in a range of 45% to 80%, a ratio of crystal gains having a crystal grain size of 2.0 µm to 6.0 µm in equivalent circle diameter being in a range of 5% to 15%, and a ratio of crystal grains having a crystal grain size of more than 6.0 µm in equivalent circle diameter being 2.7% or less. Therefore, the reflectance of the ceramics substrate for mounting a light-emitting element (1) can be improved, and a ceramics substrate for mounting a light-emitting element with high thermal conductivity can be produced.
CERAMICS SUBSTRATE FOR MOUNTING LIGHT-EMITTING ELEMENT AND LIGHT- EMITTING DEVICE
There is provided a ceramics substrate for mounting a light-emitting element having high thermal conductivity which can achieve high reflectance and which can enhance heat dissipation performance to extend the lifetime of a light-emitting element. A ceramics substrate for mounting a light-emitting element includes a ceramic sintered body, the ceramic sintered body having a mounting section on which a light-emitting element is mounted, in a surface portion on a mounting section side of the ceramic sintered body, a ratio of crystal grains having a crystal grain size of 0.2 µm to 1.0 µm in equivalent circle diameter being in a range of 45% to 80%, a ratio of crystal gains having a crystal grain size of 2.0 µm to 6.0 µm in equivalent circle diameter being in a range of 5% to 15%, and a ratio of crystal grains having a crystal grain size of more than 6.0 µm in equivalent circle diameter being 2.7% or less. Therefore, the reflectance of the ceramics substrate for mounting a light-emitting element (1) can be improved, and a ceramics substrate for mounting a light-emitting element with high thermal conductivity can be produced.
CERAMICS SUBSTRATE FOR MOUNTING LIGHT-EMITTING ELEMENT AND LIGHT- EMITTING DEVICE
KERAMIKSUBSTRAT FÜR EINE HALTERUNG EINES LICHTEMITTIERENDEN ELEMENTS UND LICHTEMITTIERENDE VORRICHTUNG
SUBSTRAT CÉRAMIQUE POUR LE MONTAGE D'UN ÉLÉMENT ÉMETTANT DE LA LUMIÈRE ET DISPOSITIF ÉMETTANT DE LA LUMIÈRE
SHIKATA KUNIHIDE (author) / KUSANO KAZUHIDE (author)
2018-06-27
Patent
Electronic Resource
English
LIGHT EMITTING ELEMENT-MOUNTING SUBSTRATE AND LIGHT EMITTING APPARATUS
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