DOI: https://doi.org/10.29363/nanoge.emlem.2024.028
Publication date: 13th July 2024
Imposing strong quantum confinement in lead halide perovskite nanocrystals enhances the electronic interactions of charge carriers within each nanocrystal and promotes the delocalization of the exciton wavefunction between the nanocrystals in the closely packed quantum dot assemblies. Such enhanced intra- and inter-quantum dot electronic (or exciton) coupling in strong confinement regime can enhance the capability of perovskite quantum dots as the source of hot electrons and coherent photons. Here, we investigated: (i) the generation of hot electrons via Auger hot electron upconversion in strongly quantum-confined cesium lead bromide (CsPbBr3) nanocrystals doped with Mn2+ and (ii) the coherent photon emission as the superradiance from the superlattices of CsPbBr3 quantum dots. The enhanced exciton-dopant interaction in strongly quantum-confined CsPbBr3 quantum dots proved beneficial for energetic hot electron generation and allowed for the utilization of the long-lived dark exciton in such processes at low temperatures. The closely-packed QD superlattice CsPbBr3 quantum dots exhibited coherent photon emission as superradiance significantly better than the larger weakly-confined quantum dots taking advantage of the facilitated exciton delocalization in the superlattices formed from the strongly-confined quantum dots.
This work was supported by National Science Foundation and Welch foundation.
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