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confinement in small-size CsPbBr
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Murray, C. B.; Norris, D. J.; Bawendi, M. G., Synthesis and
Characterization of Nearly Monodisperse CdE (E=S, Se, Te)
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to naphthalene which has triplet energy of 2.6 eV , with a
driving force of only ~0.1 eV; see Fig. S11 for details.
Naphthalene triplets can be used for visible-to-UV photon
7
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Becker, M. A.; Vaxenburg, R.; Nedelcu, G.; Sercel, P. C.;
Shabaev, A.; Mehl, M. J.; Michopoulos, J. G.; Lambrakos, S. G.;
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Lead Halide Perovskites. Nature 2018, 553, 189.
radicals with very strong reducing power for photoredox
catalysis .
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M. A., Solid-State Infrared-to-Visible Upconversion Sensitized by
Colloidal Nanocrystals. Nat. Photon. 2015, 10, 31-34.
To summarize, we measured triplet energy transfer (TET)
dynamics in CsPbBr NC-pyrene complexes with varying NC
3
sizes (edge length from 3.5 to 11.2 nm) using static and time-
resolved spectroscopy. We found that while TET efficiency
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was almost zero for commonly-used bulk-like CsPbBr NCs, it
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Mongin, C.; Garakyaraghi, S.; Razgoniaeva, N.; Zamkov, M.;
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Castellano, F. N., Direct Observation of Triplet Energy Transfer from
Semiconductor Nanocrystals. Science 2016, 351, 369-372.
1
0.
Huang, Z.; Tang, M. L., Designing Transmitter Ligands That
could be enhanced to ~99% for strongly-confined NCs. The
measured TET rates scaled linearly with the size-dependent
Mediate Energy Transfer between Semiconductor Nanocrystals and
Molecules. J. Am. Chem. Soc. 2017, 139, 9412-9418.
carrier probability density at the CsPbBr
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NC surfaces,
11.
Huang, Z.; Li, X.; Mahboub, M.; Hanson, K. M.; Nichols, V.
M.; Le, H.; Tang, M. L.; Bardeen, C. J., Hybrid Molecule–Nanocrystal
Photon Upconversion Across the Visible and Near-Infrared. Nano Lett.
consistent with the Dexter-type TET mechanism requiring
donor-acceptor wavefunction exchange. This study not only
directly demonstrates the linear scaling between TET rate and
donor-acceptor wavefunction overlap for NC-PAH systems,
but also shows that quantum confinement effect is essential for
efficient TET from perovskite NCs for their applications
ranging from photon upconversion, photoredox catalysis to
photodynamic therapy.
2
015, 15, 5552-5557.
12. Okumura, K.; Mase, K.; Yanai, N.; Kimizuka, N., Employing
Core-Shell Quantum Dots as Triplet Sensitizers for Photon Upconversion.
Chem. Eur. J. 2016, 22, 7721-7726.
1
3.
Yanai, N.; Kimizuka, N., New Triplet Sensitization Routes for
Photon Upconversion: Thermally Activated Delayed Fluorescence
Molecules, Inorganic Nanocrystals, and Singlet-to-Triplet Absorption.
Acc. Chem. Res. 2017, 50, 2487-2495.
1
4.
Gray, V.; Xia, P.; Huang, Z.; Moses, E.; Fast, A.; Fishman, D.
ASSOCIATED CONTENT
Supporting Information. Figures S1-S11, Table S1, sample
preparations, TA experiment set-ups, other supporting contents.
A.; Vullev, V. I.; Abrahamsson, M.; Moth-Poulsen, K.; Lee Tang, M.,
CdS/ZnS Core–Shell Nanocrystal Photosensitizers for Visible to UV
Upconversion. Chem. Sci. 2017, 8, 5488-5496.
1
5.
Lu, J.; Pattengale, B.; Liu, Q.; Yang, S.; Shi, W.; Li, S.; Huang,
J.; Zhang, J., Donor–Acceptor Fluorophores for Energy-Transfer-
Mediated Photocatalysis. J. Am. Chem. Soc. 2018, 140, 13719-13725.
AUTHOR INFORMATION
Corresponding Author
1
6.
Ghosh, I.; Shaikh, R. S.; König, B., Sensitization-Initiated
Electron Transfer for Photoredox Catalysis. Angew. Chem. Int. Ed. 2017,
56, 8544-8549.
*
17.
Welin, E. R.; Le, C.; Arias-Rotondo, D. M.; McCusker, J. K.;
Notes
MacMillan, D. W. C., Photosensitized, Energy Transfer-Mediated
Organometallic Catalysis through Electronically Excited Nickel(II).
Science 2017, 355, 380.
The authors declare no competing financial interest.
18.
Mase, K.; Okumura, K.; Yanai, N.; Kimizuka, N., Triplet
ACKNOWLEDGMENT
Sensitization by Perovskite Nanocrystals for Photon Upconversion. Chem.
Commun. 2017, 53, 8261-8264.
We gratefully acknowledge the financial supports from the
Ministry of Science and Technology of China (2018YFA0208703)
and the National Natural Science Foundation of China
19.
Li, X.; Fast, A.; Huang, Z.; Fishman, D. A.; Tang, M. L.,
Complementary Lock-and-Key Ligand Binding of a Triplet Transmitter to
a Nanocrystal Photosensitizer. Angew. Chem. Int. Ed. 2017, 56, 5598-
(21773239).
5
2
602.
0.
Dong, Y.; Qiao, T.; Kim, D.; Parobek, D.; Rossi, D.; Son, D.
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