Patent ID: 7164148

Claim:
A light emitting device comprising: a light emitting element which is a group III nitride semiconductor laser and emits a light having a wavelength in the range from 395 nm to 415 nm; a sub mount on which the semiconductor laser is bonded with a solder; a heat sink on which the sub mount is bonded with Ag paste containing an organic adhesive and Si organic compound; and a package hermetically sealed and housing at least the light emitting device and the sub mount and the heat sink; wherein the vapor pressure of Si organic compound gas in the package by gas chromatography mass-spectroscopy is lower than or equal to 5.4×10 2 N/m 2 in case the optical output of the laser is 3 mW and is lower than or equal to 8.02×10 −1 N/m 2 in case the optical output of the laser is 30 mW and is lower than or equal to 1.2×10 −2 N/m 2 in case the optical output of the laser is 300 mW.