期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 20, 页码 11099-11110出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b02446
关键词
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资金
- National Science Foundation [CBET-1517273, CHE-0832622, ECCS-1202471, ECCS-1229563]
- National Academy of Sciences of Ukraine [VC/157]
- FP7-Marie Curie Actions: ITN Nano2Fun GA [607721]
- Russian Science Foundation [14-43-00052]
- Air Force Office of Scientific Research MURI [FA9550-10-1-0558]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1517273] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1202471] Funding Source: National Science Foundation
The synthesis, comprehensive linear photo physical and photochemical study, two-photon absorption (2PA) spectrum, ultrafast relaxation kinetics in the excited states, and efficient superluminescence properties of a new symmetrical three-armed star-shaped squaraine derivative (1) are presented. The steady-state spectral parameters of 1 in a number of organic solvents, including fluorescence excitation anisotropy spectra, revealed a weak interaction between the squaraine branches and the effect of symmetry breaking in the ground electronic state. The degenerate 2PA spectrum of 1 was obtained over a broad spectral range with a maximum cross section of similar to 8000 GM using the open aperture Z-scan technique. The nature of the fast dynamic processes in the excited electronic states of 1 was investigated by the femtosecond transient absorption pump probe method, revealing characteristic relaxation times of similar to 3-4 ps. The efficient superluminescence emission of 1 was observed in relatively low concentration solution (approximate to 2.3.10(-4) M) under femtosecond transverse pumping. A quantum-chemical study of 1 was performed using ZINDO/S//DFTB theory levels. Simulated 1PA and 2PA absorption spectra were found to be in a good agreement with experimental data. The figure of merit for 1 is similar to 10(11) GM,(1) one of the highest values ever reported for two-photon fluorescence molecular probes, suggesting strong potential for its application in two-photon fluorescence microscopy and bioimaging.
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