论文标题
低阈值，高度稳定的胶体量子点短波红外激光通过抑制陷阱辅助螺旋钻重组
Low-threshold, highly stable colloidal quantum dot short-wave infrared laser enabled by suppression of trap-assisted Auger recombination
论文作者
论文摘要
PB- chalcogenide胶体量子点（CQD）是有吸引力的材料，可在红外光谱中用作可调激光介质。然而，由于陷阱状态的存在导致的过度非放射性螺旋螺旋体重组通过迅速灭绝激子种群来胜过光放大，从而导致高增益阈值。在这里，我们采用了CQD和ZnO纳米晶体的二元混合物，以钝化PBS-CQD增益培养基的间隙陷阱状态。使用瞬态吸收，我们测量了螺旋螺旋寿命增加五倍，证明了陷阱辅助螺旋钻重组的抑制。通过这样做，我们可以减少两倍的自发发射（ASE）阈值。最后，通过将我们提出的二进制混合物集成到DFB谐振器中，我们在1650 nm处展示了单模激光发射，线宽为1.23 nm（0.62 MeV），在低光（385μj.cm-cm-cm-cm-cm-2）下运行。该系统中的螺旋螺旋抑制允许在室温和环境条件下记录5小时的CQD激光器实现前所未有的激光稳定性。
Pb-chalcogenide colloidal quantum dots (CQDs) are attractive materials to be used as tuneable laser media across the infrared spectrum. However, excessive nonradiative Auger recombination due to the presence of trap states outcompetes light amplification by rapidly annihilating the exciton population, leading to high gain thresholds. Here, we employ a binary blend of CQDs and ZnO nanocrystals in order to passivate the in-gap trap states of PbS-CQD gain medium. Using transient absorption, we measure a five-fold increase in Auger lifetime demonstrating the suppression of trap-assisted Auger recombination. By doing so, we achieve a two-fold reduction in amplified spontaneous emission (ASE) threshold. Finally, by integrating our proposed binary blend to a DFB resonator, we demonstrate single-mode lasing emission at 1650 nm with a linewidth of 1.23 nm (0.62 meV), operating at a low lasing threshold of ~385 μJ.cm-2. The Auger suppression in this system has allowed to achieve unprecedented lasing emission stability for a CQD laser with recorded continuous operation of 5 hours at room temperature and ambient conditions.
