Suppression of Photoexcited Small Polarons-Mediated Energy Transfer to Boost Photoluminescence of Lanthanide-Titanium Nanoclusters.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39772769.
- Also identified by DOI 10.1021/acs.nanolett.4c05982.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Lanthanide (Ln<sup>3+</sup>)-titanium-based molecular nanoclusters (NCs) have attracted much attention due to their atomically precise total structure and promising optical behavior, while there is still minimal cognition of structure-dictated electron relaxation dynamics in such an NCs regime with unsatisfied photoluminescence quantum yield (PLQY, in general below 20%). Herein, the photoexcited small polarons (i.e., local electron-phonon coupling) are identified and emphasized in modulating the emission of Ln<sup>3+</sup> NCs. Taking 4-<i>tert</i>-butylbenzoate coordinated Eu<sub>2</sub>Ti<sub>4</sub> NCs as a model, the excited electron is capable of being captured by the Ti<sup>4+</sup> to form the Ti<sup>3+</sup>-dominated small polarons, which allows influencing the ligands-sensitive antenna effect for Eu<sup>3+</sup> emission. Most importantly, by chelating the Eu<sub>2</sub>Ti<sub>4</sub> NCs with Eu<sub>3</sub>Ti<sub>3</sub> units bilaterally, the evolved Eu<sub>8</sub>Ti<sub>10</sub> NCs perform suppressed lattice vibration and therefore eliminate the photoexcited small polaron-mediated energy transfer, giving a remarkable enhancement in PLQY, from 17.6% to 73.1%.