MQW size reduction for improved external quantum efficiency

A light source comprising:

• a backplane including drive circuits formed thereon;
• an array of micro-light emitting diodes (micro-LEDs) bonded to the backplane, each micro-LED of the array of micro-LEDs including a mesa structure that includes:
• a p-doped semiconductor layer;
• an n-doped semiconductor layer;
• an active region between the p-doped semiconductor layer and the n-doped semiconductor layer, wherein a shape of the active region of a first micro-LED of the array of micro-LEDs is different from a shape of the active region of a second micro-LED of the array of micro-LEDs;
• and
• a dielectric layer underneath the p-doped semiconductor layer or the n-doped semiconductor layer and surrounding the active region, wherein the active region is epitaxially grown in the dielectric layer;
• and
• an array of micro-lenses on the array of micro-LEDs, each micro-lens of the array of micro-lenses configured to collimate light emitted by a respective micro-LED of the array of micro-LEDs.