Patent ID: 7190005

Claim:
A light emitting diode comprising: a stack of gallium nitride based layers configured to emit light responsive to an electrical input; a light-transmissive substrate having a front side and a back side, the gallium nitride based layer stack disposed on the front side, the substrate being light-transmissive for the light produced by the gallium nitride based layer stack; and a metallization stack including a solderable layer formed on the back side of said substrate, the metallization stack (i) reflecting a portion of the light produced by the gallium nitride based layer stack toward the front side of the substrate, and (ii) attaching the light transmissive substrate to an associated support by a soldered bond, the metallization stack further including an adhesion layer directly adjacent to the back side of the substrate and secured to the back side of the substrate and secured to the solderable layer to effectuate a securing of the solderable layer to the substrate, and first and second diffusion barrier layers arranged between the adhesion layer and the solderable layer that substantially prevent intermixing between the adhesion layer and the solderable layer, the first diffusion barrier layer secured to the adhesion layer and the second diffusion barrier layer secured to the solderable layer.