Patent ID: 7498187

Claim:
A method for producing gallium nitride light emitting diode wafer, wherein the first layer of electrodes of the wafer is formed by spraying metal material in nano particles onto the surface of gallium nitride epitaxial layer by way of magneto sputtering, and following that at least one layer of high work function metal film is deposited onto the surface of the metal layer, and the ratio of the thickness of the metal layer to that of high work function metal film is 1: 0.5˜4; the metal layer is nickel metal layer and its thickness is between 1 nanometer to 100 nanometers; the second layer of electrodes is formed with at least two layers of high work function metals are being deposited by way of electron-beam or sputtering apparatus as electrodes and metal lift-off technology is used to form electrodes in symmetrical shape; the materials for electrodes are chromium, platinum and gold; positive electrode is in the shape of a letter p and the negative electrode is in the shape of a letter d.