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Light‐Harvesting Organic Nanocrystals Capable of Photon Upconversion
Author(s) -
Li Li,
Zeng Yi,
Yu Tianjun,
Chen Jinping,
Yang Guoqiang,
Li Yi
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701389
Subject(s) - photon upconversion , materials science , nanocrystal , quantum yield , excited state , optoelectronics , excitation , annihilation , photonics , acceptor , photochemistry , nanotechnology , doping , chemistry , optics , atomic physics , physics , fluorescence , quantum mechanics , condensed matter physics
Harvesting and converting low energy photons into higher ones through upconversion have great potential in solar energy conversion. A light‐harvesting nanocrystal assembled from 9,10‐distyrylanthracene and palladium(II) meso ‐tetraphenyltetrabenzoporphyrin as the acceptor and the sensitizer, respectively effects red‐to‐green upconversion under incoherent excitation of low power density. An upconversion quantum yield of 0.29±0.02 % is obtained upon excitation with 640 nm laser of 120 mW cm −2 . The well‐organized packing of acceptor molecules with aggregation‐induced emission in the nanocrystals dramatically reduces the nonradiative decay of the excited acceptor, benefits the triplet–triplet annihilation (TTA) upconversion and guides the consequent upconverted emission. This work provides a straightforward strategy to develop light‐harvesting nanocrystals based on TTA upconversion, which is attractive for energy conversion and photonic applications.