Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 6, Pages 2822-2827Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013725
Keywords
intersystem crossing; ligand-protected metal clusters; superatoms; triplet sensitizers; triplet-triplet annihilation photon upconversion
Categories
Funding
- Sumitomo Foundation [170899]
- Rikkyo University Special Fund for Research [20K15110, 20K05653]
Ask authors/readers for more resources
This study investigated noble metal clusters as new NIR-absorbing sensitizers, finding that PtAg24(SR)(18) exhibits strong triplet-triplet annihilation upconversion (UC) emission.
Photon upconversion (UC) from near-infrared (NIR) to visible has been realized using singlet-to-triplet absorption of sensitizers, which are currently limited to osmium complexes and semiconductor nanocrystals. Motivated by the atomically precise tunability of electronic structure and photophysical properties of noble metal clusters, which often possess absorption bands that extend into the NIR region, we investigated MAg24(SR)(18) (M=Ag, Pt; SR=2,4-dimethylbenzenethiolate) clusters as a new NIR-absorbing sensitizer for triplet-triplet annihilation UC. Combined with a blue light emitter, the NIR excitation (lambda(ex)=785 nm) of Ag-25(SR)(18) results in no UC emission, while PtAg24(SR)(18) exhibits strong UC emission. This enhancement is primarily due to a significant increase in the intersystem crossing quantum yield of the cluster associated with the spin-orbit coupling enhancement in the M@Ag-12 core.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available