Harnessing Quantum Shells for Next-Generation Optoelectronic Devices

We will discuss a novel class of low-dimensional semiconductors known as colloidal semiconductor quantum shells (QSs). These nanomaterials demonstrate significant suppression of Auger recombination - a major bottleneck in the efficiency and stability of quantum dots. By reducing this recombination pathway, QSs enhance both the quantum efficiency and coherence of their emission, making them highly effective as quantum light sources. Our analysis focuses on the unique optical and electronic properties of QSs, positioning them as an alternative to conventional quantum dots, particularly for applications requiring stable and coherent photon emission. Moreover, QSs are explored for their roles beyond quantum emitters, including as optical gain media, where their reduced non-radiative losses provide a distinct advantage in terms of optical gain, gain lifetime, and overall stability. Moreover, recent studies have demonstrated their effectiveness in X-ray scintillation, surpassing even the best commercial scintillators in brightness and response time. These advantages are attributed to QSs' ability to mitigate surface and Auger recombination, making them very efficient at handling high-intensity optical and electrical excitations across a range of technologies.