Two triplet emitting states in one emitter: Near-infrared dual-phosphorescent Au<sub>20</sub> nanocluster.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36989358.
- Also identified by DOI 10.1126/sciadv.adg3587 and PMC identifier 10058230.
- Licence recorded as CC BY-NC.
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Abstract
Intrinsic dual-emission (DE) of gold nanoclusters in the near-infrared (NIR) are fascinating for fundamental importance and practical applications, but their synthesis remains a formidable challenge and sophisticated excited-state processes make elucidating DE mechanisms much more arduous. Here, we report an all-alkynyl-protected gold nanocluster, <b>Au20</b>, showing a prolate Au<sub>12</sub> tri-octahedral kernel surrounded by two Au<sub>2</sub>(CZ-PrA)<sub>3</sub> dimers, four Au(CZ-PrA)<sub>2</sub> monomers, and two CZ-PrA<sup>-</sup> bridges. <b>Au20</b> exhibits distinguished photophysical properties including NIR DE at 820 and 940 nm, microsecond radiative relaxation, and 6.26% photoluminescent quantum yield at ambient environment in nondegassed solution. Combining systematic studies on steady/transient spectroscopy and theoretical calculation, we identified two triplet charge transfer (CT) states, ligand-to-kernel and kernel-based CT states as DE origins. Furthermore, this NIR DE exhibits highly independent and sensitive response to surrounding environments, which well coincide with its mechanism. This work not only provides a substantial structure model to understand a distinctive DE mechanism but also motivates the further development of NIR DE materials.