Display devices with multiple emitters

A display device comprising:

• a substrate including a first emitter and a second emitter thereon,
• the first emitter including a first lower active quantum well (QW) region that has a first emission spectrum spanning a first spectral range,
• the second emitter including (i) an upper active QW region that has a second emission spectrum spanning a second spectral range that is distinct from the first spectral range, (ii) a second lower active QW region having the first emission spectrum and being located between the upper active QW region and the substrate, and (iii) a barrier layer between the second lower active QW region and the upper active QW region for suppressing emission of the second lower active QW region,
• the first emitter having a first height with respect to a top surface of the substrate,
• the substrate defining a recess that extends into the substrate, the second emitter being partially contained within the recess and partially outside the recess, such that a second height of the second emitter with respect to the top surface equals the first height, and
• an overall height of the second emitter is greater than an overall height of the first emitter.

A display device comprising:

• a substrate including a first emitter and a second emitter disposed thereon, the second emitter being adjacent to the first emitter in a direction parallel to a top surface of the substrate;
• the first emitter including a first lower active quantum well (QW) region having a first emission spectrum with a first spectral range,
• the second emitter including:
• an upper active QW region having a second emission spectrum with a second spectral range distinct from the first spectral range;
• a second lower active QW region having the first emission spectrum and being disposed between the upper active QW region and the substrate;
• and
• a barrier layer disposed between the second lower active QW region and the upper active QW region, the barrier layer suppressing emission from the second lower active QW region, and
• at least one of:
• a width of the second lower active QW region exceeding a width of the first lower active QW region in the direction parallel to the top surface of the substrate;
• or
• a cross-sectional area of the second lower active QW region in a plane parallel to the top surface of the substrate exceeding a cross-sectional area of the first lower active QW region.