Photonic applications of semiconductor quantum dots (QDs) had significant drawbacks due to their ultrafast Auger decay of multiple excitons. These non-radiative processes have hindered the performance of high-brightness light-emitting diodes and lasing devices. The emergence of the colloidal quantum well (QW) architecture, where a semiconductor quantum shell with an inverted QD geometry, has suppressed Auger recombination. QW morphology, where the quantum confined HgS layer is sandwiched between two large CdS domains, leads to ultra-long biexciton lifetime (&gt;10 ns) and large biexciton quantum yields owing to the large exciton volume. Moreover, architecture-induced exciton-exciton repulsions have led to the splitting of exciton and biexciton optical transitions, which resulted in broad optical gain bandwidths. High single and biexciton lifetimes and long single exciton gain lifetime have rendered this geometry a worthy candidate for developing optically and electrically pumped gain media.

Quantum shell architecture improves multi-exciton dynamics in near IR

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