Patent ID: 8263993

Claim:
An LED, comprising: a base substrate; and an emitter layer on a surface of the substrate configured to emit light in an emission half angle, wherein the emitter layer has a shaped portion comprising: an emitter area; an exit area a height from the emitter area; sidewalls running from the emitter area to the exit area, wherein each of the sidewalls comprises a plurality of areas at different angles relative to the emitter area and wherein each sidewall is positioned and shaped to cause at least a majority of rays having a straight transmission path from the emitter area to that sidewall to reflect to the exit area with an angle of incidence at the exit area at less than or equal to a critical angle at an emitter layer to substrate boundary; and wherein the size of the exit area and shapes of the sidewalls are configured so that at least 60% of the light generated in the emitter layer exits the emitter layer into the substrate in the emission half angle.