Patent ID: 8912025

Claim:
A method of manufacturing high brightness LED devices, the method of manufacturing comprising: providing a gallium and nitrogen substrate having a surface with a plurality of light emitting diodes; treating the substrate to form a plurality of trenches among the light emitting diodes, the plurality of trenches extending from the surface toward an opposing surface, by scanning a coherent beam of energy onto the surface wherein the step of treating causes formation of slag along the plurality of trenches; and subjecting the trenches and the slag to a chemical solution including potassium ferricyanide to substantially remove the slag without substantially changing the trenches, wherein the temperature of the chemical solution ranges from about 60 to 75 degrees Celsius, and the chemical solution comprises potassium hexacyanoferrate in a range of 30% to 40% by weight, potassium hydroxide in a range of 1% to 5% by weight, and water in a range of 55%-69% by weight.