Abstract
The exciton-to-hot electron upconversion phenomenon in Mn-doped semiconductor quantum dots (QDs) produces highly energetic hot electrons. These electrons have an average energy just a fraction of 1 eV below the vacuum level, with a subpopulation of hot electrons existing above the vacuum level. This hot electron upconversion process is similar to photon upconversion in lanthanide-doped nanoparticles. However, the final state here is a highly excited hot electron in the conduction band of the host QDs, not a state emitting higher-energy photons. These upconverted hot electrons can be harnessed to carry out thermodynamically and kinetically challenging reduction reactions, benefiting from their high excess kinetic energy and long-range transfer capability. The presentation will discuss recent demonstrations of the benefits of these upconverted hot electrons in various photocatalytic reduction and redox-neutral reactions. Additionally, the development of new materials for more efficient hot electron upconversion and the potential to broaden the application of these energetic hot electrons beyond photocatalysis will be discussed.
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