Abstract
Photoluminescence up-conversion is a near ubiquitous process in colloidal semiconductor nanocrystals. Observed efficient up-conversion in high emission quantum yield CsPbBr3 nanocrystals suggest their possible use in optical refrigeration as well as light harvesting. We discuss efforts to understand the mechanism behind efficient up-conversion as well as studies into the identity of intermediate states responsible for the phenomenon. Here, photothermal measurements suggest real intermediate states deep in the gap that are responsible for efficient up-conversion.
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