Journal ArticleDOI
Investigation of two-photon absorption properties in branched alkene and alkyne chromophores.
Ajit Bhaskar,Guda Ramakrishna,Zhikuan Lu,Robert J. Twieg,Joel M. Hales,David J. Hagan,Eric W. Van Stryland,Theodore Goodson +7 more
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TLDR
It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state in these branched systems.Abstract:
Novel alkene and alkyne branched structures have been synthesized, and their two-photon absorption (2PA) properties are reported. This series of alkene and alkyne trimer systems tests the mechanistic approach for enhancing the 2PA process which is usually dictated by the pi-bridging, delocalization length, and corresponding charge transfer on the 2PA cross sections. The results suggest that alkene branched systems have higher 2PA cross sections. While steady-state absorption and emission measurements were not successful in predicting the observed trend of 2PA cross sections, time-resolved measurements have explained the trends observed. It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state in these branched systems.read more
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Triarylamine: a promising core unit for efficient photovoltaic materials
Zhijun Ning,He Tian +1 more
TL;DR: New synthetic methods and the application of starburst triarylamines are described, highlighting the applications in photovoltaic and optoelectrical fields.
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Enhanced two-photon absorption of organic chromophores: theoretical and experimental assessments ∗∗
Francesca Terenziani,Claudine Katan,Ekaterina Badaeva,Sergei Tretiak,Mireille Blanchard-Desce +4 more
TL;DR: In this paper, a review of experimental and theoretical methodologies allowing detailed investigation and analysis of two-photon absorption properties of organic chromophores is presented, focusing on symmetric and asymmetric donor/acceptor substitution and branching.
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Ultrabright Luminescence from Gold Nanoclusters: Rigidifying the Au(I)-Thiolate Shell.
Kyunglim Pyo,Viraj Dhanushka Thanthirige,Kyuju Kwak,Prabhu Pandurangan,Guda Ramakrishna,Dongil Lee +5 more
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Recent Strategies to Develop Innovative Photosensitizers for Enhanced Photodynamic Therapy.
TL;DR: In this paper, a review aimed at reporting recent strategies to develop innovative organic photosensitizers for enhanced photodynamic therapy, with each example described in detail instead of providing only a general overview, to provide intuitive, vivid, and specific insights to the readers.
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Star-shaped π-conjugated oligomers and their applications in organic electronics and photonics
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References
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Journal ArticleDOI
Two-Photon Laser Scanning Fluorescence Microscopy
TL;DR: The fluorescence emission increased quadratically with the excitation intensity so that fluorescence and photo-bleaching were confined to the vicinity of the focal plane as expected for cooperative two-photon excitation.
Journal ArticleDOI
A survey of Hammett substituent constants and resonance and field parameters
Corwin Hansch,A. Leo,R. W. Taft +2 more
TL;DR: The Hammett equation has been widely used for the study and interpretation of organic reactions and their mechanisms as mentioned in this paper, and it is astonishing that u constants, obtained simply from the ionization of organic acids in solution, can frequently predict successfully equilibrium and rate constants for a variety of families of reactions in solution.
Journal ArticleDOI
Finer features for functional microdevices
TL;DR: Micromachines can be created with higher resolution using two-photon absorption, and the results can be higher resolution than previously reported using single photon absorption techniques.
Journal ArticleDOI
Water-Soluble Quantum Dots for Multiphoton Fluorescence Imaging in Vivo
Daniel R. Larson,Warren R. Zipfel,Rebecca M. Williams,S. W. Clark,Marcel P. Bruchez,Frank W. Wise,Watt W. Webb +6 more
TL;DR: This work characterized water-soluble cadmium selenide–zinc sulfide quantum dots for multiphoton imaging in live animals and found no evidence of blinking (fluorescence intermittency) in solution on nanosecond to millisecond time scales.
Journal ArticleDOI
Relationship between Absorption Intensity and Fluorescence Lifetime of Molecules
S. J. Strickler,Robert A. Berg +1 more
TL;DR: In this paper, the authors derived a modified 1/τ0=2.880×10−9n2/n2-1(gl/gu) ∫ edlnν, which should be valid for broad molecular bands when the transition is strongly allowed.
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