Crystalline color-conversion device

A crystalline color-conversion display, comprising:

• a display substrate;
• and
• a plurality of first light emitters and corresponding plurality of second light emitters located on or over the display substrate and distributed over the display substrate, wherein
• each of the plurality of first light emitters is an electrically driven first light emitter electrically connected to first and second electrical contacts, wherein the electrical contacts are for providing an electrical current signal to the first light emitter, causing the first light emitter to emit first light having a first energy in response to the electrical current signal,
• each of the corresponding plurality of second light emitters is an optically driven inorganic solid single-crystal direct-bandgap second light emitter having a bandgap of a second energy less than the first energy, and
• each first light emitter is electrically isolated from a corresponding second light emitter of the corresponding plurality of second light emitters, is located in optical association with the corresponding second light emitter, and the corresponding second light emitter is located within 0 to 250 microns of each first light emitter so that in response to the electrical current signal, each first light emitter emits a first light that is absorbed by the corresponding second light emitter and the corresponding second light emitter emits a second light having a lower energy than the first energy.