Patent ID: 7932111

Claim:
A method for fabricating semiconductor based light emitting devices, comprising: providing a plurality of semiconductor layers on a substrate wafer, said plurality of semiconductor layers forming a plurality of light emitting devices, each of said light emitting devices comprising epitaxial layers and a lift-off layer between said substrate wafer and said epitaxial layers, said lift-off layer comprising a material from the group InGaN, AlInGaN, AlInGaAs; providing a carrier comprising a junction diode on a first surface; flip-chip mounting said light emitting devices on said first surface of said carrier such that said light emitting devices are sandwiched between said carrier and said substrate wafer; exposing an n-type layer by removing said substrate wafer from said light emitting devices by exposing said lift-off layer to a solution and applying a light source, wherein said solution comprises KOH and water; and separating said carrier into singulated portions to form light emitting devices separated from one another, with each of said light emitting devices mounted to a respective portion of said carrier.