Journal
ADVANCED OPTICAL MATERIALS
Volume 7, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201900838
Keywords
charge transfer; nonlinear optics; organic cocrystals; self-assembly; two-photon absorption
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Funding
- National Natural Science Foundation of China [11874237]
- Shandong Provincial Natural Science Foundation, China [ZR2018MF030]
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Two-photon excited chromophores are widely applied for photon upconversion in organic optoelectronics. In this work, efficient two-photon excited fluorescence is observed from charge-transfer cocrystals where the molecular architectures of donor and acceptor molecules are both centrosymmetric. The superior structural symmetry of cocrystals eliminates the second harmonic generation of incident near-infrared laser. The nonlinear optical properties of cocrystals are found to be strongly correlated with the intermolecular charge-transfer interaction, bringing a wide window of excitation wavelength for the upconverted light emission. The work demonstrates that the cocrystallization of small molecules provides opportunities for the design and synthesis of novel organic optofunctional materials.
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