Abstract
Lanthanides are narrow-linewidth sources of intense emission, and their complex electronic structure allow for non-linear processes such as quantum cutting. Their extinction coefficients are however extremely low, so their emission needs to be sensitized by a neighboring chromophore or host matrix. This talk describes a mechanism for photosensitization of lanthanide ions (Ln3+) substitutionally doped into CsPbCl3 colloidal quantum dots (QDs). This mechanism involves a charge transfer intermediate state, QD+-Ln2+, resulting from photoinduced electron transfer from the excitonic state of the QD to Ln3+. Transient absorption spectroscopy helps to confirm this mechanism and obtain rate constants for the various photophysical processes within these systems.
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