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When conjugate molecules are self-assembled on the surface of semiconductors, emergent properties resulting from the electronic coupling between the conjugate moieties are of importance in the interfacial electron transfer dynamics for photoelectrochemical and optoelectronics devices. In this work, we investigate the self-assembly of the triphenylamine-oligothiophene-perylenemonoimide (PMI) molecules, denoted as BH4, on metal oxide surfaces via UV-Vis absorption, photoluminescence, transient near-infrared absorption spectroscopies, and molecular dynamic simulations, and report the excimer formation due to the π-π interaction of the PMI units between the neighboring dye molecules. To our best knowledge, this is the first experimental observation of intermolecular excimer formation when conjugate donor-acceptor molecules form a self-assembled monolayer (SAM). In addition, a long-lived (4.3μs) intermolecular charge separation is observed, and a new excimer-mediated intermolecular charger transfer (EMI-CT) mechanism is proposed. This work demonstrates that through the design of dye molecules, the excited complexes or aggregates can provide a pathway to slow down the recombination rate in photoelectrodes that utilize donor-acceptor dyad molecules.
This article was published in the following journal.
Name: Journal of the American Chemical Society
Excimer, a configurational mixing between Frenkel exciton and charge transfer resonance states, is typically regarded as a trap state that hinders desired energy or charge transfer processes in artifi...
In this paper, we report time resolved fluorescence resonance energy transfer (FRET) using femtosecond ultrafast transient absorption spectroscopy. The lifetimes of FRET are strongly dependent on the ...
Recent efforts and progress in polymer solar cells have boosted the photovoltaic efficiency of the technology. This efficiency depends not only on the device architecture but also on the materials pro...
Breaking the electroneutrality of sp2 carbon lattice is a viable way for nanocarbon to modulate the charge delocalization and to further alter the electrocatalytic activity. The positive charge spread...
Charge transfer and separation are important processes governing numerous chemical reactions. Fundamental understanding of these processes and the underlying mechanism is critical for photochemistry. ...
308 nm excimer lamp and 308 nm excimer laser have both provide interesting results in treating vitiligo. They have the same wavelength but the type of emission of the photons is different....
The hypothesis of this study is that excimer (308-nm UVB) laser added to either tazarotene 0.1% gel or acitretin 25 mg daily will lead to improved efficacy of these treatments alone. The ...
This will be a single-arm prospective internally-controlled study. Patients will undergo percutaneous externally-assembled laparoscopic donor nephrectomy where one or more 3 mm instruments...
To determine the optimal treatment frequency of 308-nm excimer laser for vitiligo and identify the key clinical variable(s) associated with the treatment efficiency under the optimal treat...
A Prospective, Randomized, Multi Center Clinical Comparison of Fellow Eyes Undergoing Lasik Using the Wavelight Allegretto Wave™ Excimer Laser in One Eye and the Amo/Visx Customvue™ or the Ladarvision 4000 Excimer Laser System in the Contralateral Eye
The purpose of this study is to compare LASIK outcomes using the WaveLight ALLEGRETTO WAVE™ wavefront guided or optimized excimer laser treatment with the AMO/VISX CustomVue™ and the L...
The introduction of functional (usually cloned) GENES into cells. A variety of techniques and naturally occurring processes are used for the gene transfer such as cell hybridization, LIPOSOMES or microcell-mediated gene transfer, ELECTROPORATION, chromosome-mediated gene transfer, TRANSFECTION, and GENETIC TRANSDUCTION. Gene transfer may result in genetically transformed cells and individual organisms.
The transfer of lymphocytes from a donor to a recipient or reinfusion to the donor.
The transfer of leukocytes from a donor to a recipient or reinfusion to the donor.
The transfer of erythrocytes from a donor to a recipient or reinfusion to the donor.
The transfer of blood platelets from a donor to a recipient or reinfusion to the donor.