Patent ID: 7659553

Claim:
A light-emitting semiconductor device protected against reflector metal migration, 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; (d) a metal-made reflector layer for redirecting toward said other major surface of the light-generating semiconductor region the light from the light-generating semiconductor region, the reflector layer being interposed between the light-generating semiconductor region and the baseplate so as to leave a substantially annular marginal space therebetween; and (e) an anti-migration seal received at least in part in the substantially annular marginal space between the light-generating semiconductor region and the baseplate for sealing the reflector layer against metal migration therefrom, the anti-migration seal being made from a metal that is less easy of migration than the metal from which is made the reflector layer.