Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 40, Pages 17726-17731Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202009066
Keywords
perovskite nanocrystals; photon upconversion; through-bond and through-space; triplet energy transfer
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Funding
- National Natural Science Foundation of China [21975253, 51961165109]
- Chinese Academy of Sciences [XDA21010206]
- Dalian City Foundation for Science and Technology Innovation [2018J12GX051]
- Dalian Institute of Chemical Physics [DICP I201914]
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Triplet energy transfer from inorganic nanocrystals to molecular acceptors has attracted strong attention for high-efficiency photon upconversion. Here we study this problem using CsPbBr(3)and CdSe nanocrystals as triplet donors and carboxylated anthracene isomers as acceptors. We find that the position of the carboxyl anchoring group on the molecule dictates the donor-acceptor coupling to be either through-bond or through-space, while the relative strength of the two coupling pathways is controlled by the wavefunction leakage of nanocrystals that can be quantitatively tuned by nanocrystal sizes or shell thicknesses. By simultaneously engineering molecular geometry and nanocrystal wavefunction, energy transfer and photon upconversion efficiencies of a nanocrystal/molecule system can be improved by orders of magnitude.
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