Patent ID: 7829910
Filing Date: 2010-11-09
Classification: B23K,H01L

Abstract:
1. A light emitting device comprising a compound semiconductor layer having therein a light emitting layer section, said compound semiconductor layer being assumed that the main surface thereof positioned on the light extraction side is referred to as a first main surface, and that the main surface thereof opposite thereto as a second main surface, having a first electrode formed on said first main surface of said compound semiconductor layer, having second electrodes formed on said second main surface, so as to be used as being electrically connected through said second electrodes to a conductive support for the device to be fixed to, wherein each of said second electrodes comprises an alloyed contact layer disposed in contact with the second main surface of said compound semiconductor layer, aimed at reducing contact resistance with said compound semiconductor layer, and a solder layer connecting said alloyed contact layer to said conductive support, said solder layer having formed therein a Sn-base solder layer disposed on said alloyed contact layer side and composed of a Sn-base metal mainly containing Sn and having a melting point lower than that of said alloyed contact layer, and a Au—Sn-base solder layer disposed in contact with said Sn-base solder layer on the opposite side of said alloyed contact layer, containing 30% by mass or more and 90% by mass or less of Au, and 10% by mass or more and 70% by mass or less of Sn, the total content of Au and Sn being 80% by mass or more, and having the melting point higher than that of said Sn-base solder layer, and the Sn content of said Sn-base solder layer is 75% by mass or more.