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Pb-chalcogenide colloidal quantum dots (CQDs) are attractive materials to beused as tuneable laser media across the infrared spectrum. However, excessivenonradiative Auger recombination due to the presence of trap states outcompeteslight amplification by rapidly annihilating the exciton population, leading tohigh gain thresholds. Here, we employ a binary blend of CQDs and ZnOnanocrystals in order to passivate the in-gap trap states of PbS-CQD gainmedium. Using transient absorption, we measure a five-fold increase in Augerlifetime demonstrating the suppression of trap-assisted Auger recombination. Bydoing so, we achieve a two-fold reduction in amplified spontaneous emission(ASE) threshold. Finally, by integrating our proposed binary blend to a DFBresonator, we demonstrate single-mode lasing emission at 1650 nm with alinewidth of 1.23 nm (0.62 meV), operating at a low lasing threshold of ~385{\mu}J.cm-2. The Auger suppression in this system has allowed to achieveunprecedented lasing emission stability for a CQD laser with recordedcontinuous operation of 5 hours at room temperature and ambient conditions.

Low-threshold, highly stable colloidal quantum dot short-wave infrared laser enabled by suppression of trap-assisted Auger recombination