Linear and Nonlinear Optical Properties of Photoresponsive [60]Fullerene Hybrid Triads and Tetrads with Dual NIR Two-Photon Absorption Characteristics

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• 作者：Seaho Jeon ; Joy Haley ; Jonathan Flikkema ; Venkatram Nalla ; Min Wang ; Matthew Sfeir ; Loon-Seng Tan ; Thomas Cooper ; Wei Ji ; Michael R. Hamblin ; Long Y. Chiang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：August 22, 2013
• 年：2013
• 卷：117
• 期：33
• 页码：17186-17195
• 全文大小：468K
• 年卷期：v.117,no.33(August 22, 2013)
• ISSN：1932-7455

文摘

Two C₆₀-(antenna)_x analogous compounds having branched hybrid triad C₆₀(>DPAF-C₁₈)(>CPAF-C_2M) and tetrad C₆₀(>DPAF-C₁₈)(>CPAF-C_2M)₂ nanostructures were synthesized and characterized. The structural design was intended to facilitate the ultrafast femtosecond intramolecular energy transfer from photoexcited C₆₀[>¹(DPAF)*-C₁₈](>CPAF-C_2M)_1or2 or C₆₀(>DPAF-C₁₈)[>¹(CPAF)*-C_2M]_1or2 to the C₆₀> cage moiety upon two-photon pumping at either 780 or 980 nm, respectively. The latter nanostructure showed approximately equal extinction coefficients of optical absorption over 400鈥?50 nm that corresponds to near-IR two-photon-based excitation wavelengths at 780鈥?100 nm for broadband nonlinear optical (NLO) applications. Aside from their enhanced two-photon absorption (2PA) activity at 780 nm, we also demonstrated ultrafast photoresponses at 980 nm showing 2PA cross-section (蟽₂) values of 995鈥?100 GM for the hybrid tetrad. These 蟽₂ values were correlated to the observed good efficiency in reducing femtosecond light-transmittance down to 35% at the light intensity of 110 GW/cm². Accordingly, 2PA characteristics of these nanostructures at multiple NIR wavelengths provided support for their suitability in uses as broadband NLO nanomaterials at 600鈥?100 nm that includes the 2PA ability of two antenna, DPAF (700鈥?50 nm) and CPAF (850鈥?100 nm), and the fullerene cage at shorter wavelengths (600鈥?00 nm).