| 摘要 |
An object of the present invention is to provide a semiconductor light emitting device having a long lifespan by improving yield in mounting. In order to achieve this object, a semiconductor light emitting device includes a semiconductor light emitting element chip having an n-type GaN substrate, a heat sink made of SiC onto which the semiconductor light emitting element chip is mounted, a solder made of AuSn which joins the n-type GaN substrate to the heat sink, a support base onto which the heat sink is mounted, and a solder made of In or SnAgCu which joins the heat sink to the support base. The solder has a thickness in a range from 1 mum or more to 20 mum or less, and the heat sink has a thickness in a range from 100 mum or more to 500 mum or less.
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