Patent ID: 7675070
Filing Date: 2010-03-09
Classification: H01L

Abstract:
1. A light-emitting semiconductor device having a reflector layer, the light-emitting semiconductor device comprising: (a) a light-generating semiconductor region having a plurality of semiconductor layers for generating light, the light-generating semiconductor region having a pair of opposite major surfaces; (b) a baseplate held against one of the pair of opposite major surfaces of the light-generating semiconductor region; (c) an electrode on the other major surface of the light-generating semiconductor region; and (d) an electroconductive reflector layer interposed between the baseplate and the light-generating semiconductor region for reflecting the light from the light-generating semiconductor region toward said other major surface of the light-generating semiconductor region, the reflector layer being made from a silver-base alloy containing a major proportion of silver and at least one additive selected from the group consisting of copper, gold, palladium, neodymium, silicon, iridium, nickel, tungsten, zinc, gallium, titanium, magnesium, yttrium, indium, and tin, the proportion of the selected additive or additives with respect to that of silver being in the range of from about 0.5 percent by weight to about 10.0 percent by weight.