7 October 2014 Synthesis of dual NIR two-photon absorptive [60]fullerenyl multiadducts for nonlinear light-transmittance reduction application
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Synthesis of several C60-(antenna)x conjugates was performed to demonstrate high flexibility in the design of organic nonlinear optical (NLO) nanostructures showing broadband characteristics with capability to absorb light over a wide range of wavelengths. It was achieved by covalent attachment of a hybrid combination of two types of light-harvesting fluorescent antenna chromophores on a C60 cage. Ultrafast photoresponsive intramolecular Föster resonance energy-transfer among antenna units and shared excited energy-accepting C60 cage is proposed as a plausible mechanism to enhance the broadband NLO ability. Characterization of the branched triad C60(>DPAF-C18)(>CPAF-C2M) and the tetrad C60(>DPAF-C18)(>CPAF-C2M)2 was carried out by various spectroscopic techniques. These compounds showed approximately equal extinction coefficients of optical absorption over 400‒550 nm that corresponds to near-IR two-photon based excitation wavelengths at 780‒1100 nm. These nanomaterials may be utilized in NLO coatings for achieving efficient light-transmittance reduction at the same NIR wavelengths.
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Seaho Jeon, Seaho Jeon, Min Wang, Min Wang, Taizoon Canteenwala, Taizoon Canteenwala, Loon-Seng Tan, Loon-Seng Tan, Wei Ji, Wei Ji, Thomas Cooper, Thomas Cooper, Long Chiang, Long Chiang, "Synthesis of dual NIR two-photon absorptive [60]fullerenyl multiadducts for nonlinear light-transmittance reduction application", Proc. SPIE 9181, Light Manipulating Organic Materials and Devices, 918105 (7 October 2014); doi: 10.1117/12.2060935; https://doi.org/10.1117/12.2060935

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