Multi-Color Monolithic Light-Emitting Diodes and Methods for Making the Same

A process for producing a light emitting diode (LED) device, the process comprising:

• forming a plurality of quantum dots on a surface of a layer comprising a first area and a second area;
• exposing the first area of the surface to light having a first wavelength while exposing the first area to a first etchant that, due at least in part to an interaction between the light at the first wavelength and the plurality of quantum dots in the first area, causes the plurality of quantum dots in the first area to be etched at a first etch rate while the plurality of quantum dots in the first area has a dimension at or greater than a first threshold dimension, and at a second etch rate while the plurality of quantum dots in the first area has a dimension less than the first threshold dimension, the first etch rate being higher than the second etch rate;
• exposing the second area of the surface to light having a second wavelength shorter than the first wavelength while exposing the second area to a second etchant that, due at least in part to an interaction between the light at the second wavelength and the plurality of quantum dots in the second area, causes the plurality of quantum dots in the second area to be etched at a third etch rate while the plurality of quantum dots in the second area has a dimension at or greater than a second threshold dimension, and at a fourth etch rate while the plurality of quantum dots in the second area has a dimension less than the second threshold dimension, the second threshold dimension being smaller than the first threshold dimension, the third etch rate being higher than the fourth etch rate;
• and
• after exposing the first and second areas, processing the layer to form the LED device,
• wherein the plurality of quantum dots in the first area are sized to emit light substantially within a first band of wavelengths and the plurality of quantum dots in the second area are sized to emit light substantially within a second band of wavelengths different from the first band of wavelengths.