Patent ID: 7393705
Filing Date: 2008-07-01
Classification: B23K,C30B,H01L

Abstract:
1. A method for producing gallium nitride light emitting diodes comprising the steps of: (a) growing a gallium nitride epitaxial layer on a top surface of a sapphire substrate; (b) patterning the gallium nitride layer to selectively form a plurality of dies separated by trenches; (c) coating the gallium nitride layer with a phosphor layer that absorbs blue or UV radiation and re-emits radiation to produce a desired spectrum of light, (d) attaching a support structure to the gallium nitride layer with a procedure that includes filling the trenches; (e) irradiating the bottom surface of the sapphire substrate with a plurality of pulses of laser radiation having a wavelength that is substantially absorbed by the gallium nitride near the interface of the gallium nitride layer and the sapphire substrate, wherein the laser radiation is patterned so that (f) removing the sapphire substrate.