Crystalline color-conversion device

A method of making a crystalline color-conversion device, comprising:

• providing an electrically driven first light emitter for emitting first light having a first energy in response to an electrical signal;
• providing an inorganic solid single-crystal direct-bandgap second light emitter having a bandgap of a second energy less than the first energy;
• and
• micro transfer printing the second light emitter onto the first light emitter or micro transfer printing the first light emitter onto the second light emitter, wherein the second light emitter is electrically isolated from the first light emitter, is located in optical association with the first light emitter, and is located within 0 to 250 microns of the first light emitter so that in response to the electrical signal the first light emitter emits first light that is absorbed by the second light emitter and the second light emitter emits second light having a lower energy than the first energy.