Patent ID: 8569084

Claim:
A method for fabricating a light emitting device (LED), comprising: forming a light emitting structure on a sapphire substrate, wherein the light emitting structure comprises a first conductivity type semiconductor layer having Ga material and Nitride material on the sapphire substrate, an active layer on the first conductivity type semiconductor layer, and a second conductivity type semiconductor layer on the active layer; and removing the sapphire substrate from the first conductivity type semiconductor layer by a laser lift-off process; forming a mixed-period photonic crystal structure on the first conductivity type semiconductor layer after the removing of the sapphire substrate; wherein the forming of the mixed-period photonic crystal structure comprises forming a first, a second, and a third photonic crystal structures having respective a first, a second, and a third periods, wherein the first photonic crystal structure is formed by a dry etching process using a first pattern on the first conductivity type semiconductor layer, wherein the second photonic crystal structure and the third photonic crystal structure are formed by a wet etching process after removing the first pattern, wherein the first photonic crystal structure comprises a concave region and a convex region, wherein the second photonic crystal structure is formed on the concave region of the first photonic crystal structure, wherein the third photonic crystal structure is formed on the convex region of the first photonic crystal structure, and wherein the Ga material is accumulated at a top surface of the first conductivity type semiconductor layer during the removing of the sapphire substrate by the laser lift-off process to interrupt the wet etching process.