Publication date: 15th December 2025
Colloidal semiconductor nanocrystals allow for enriched color conversion essential to superior lighting and displays. These colloids span different types and heterostructures of semiconductors from colloidal quantum dots to wells. In this talk, we will present recent examples of semiconductor nanocrystal optoelectronic devices using atomically flat, tightly confined colloidal quantum wells (CQWs) [1-9]. By engineering quantum designs of the CQWs, we will show record high efficiency from their colloidal LEDs [10,11] and record high gain coefficients and low lasing thresholds from their colloidal lasers [12,13] in their classes. We will also discuss the use of these nanocrystals embedded into carefully designed dielectric media to make colloidal metadevices [14]. We will finally present highly engineered quantum wells to make a new class of single-photon emitters with high quantum purity at room temperature [15]. Given their accelerating progress, these solution-processed nanocrystals offer great promise to challenge their epitaxial thin film counterparts in semiconductor optoelectronics.
