Intramolecular and intermolecular energy transfers in donor-acceptor linear porphyrin arrays

Abstract

Articles you may be interested in Energy transfer rates and population inversion of I 4 11 / 2 excited state of Er 3 + investigated by means of numerical solutions of the rate equations system in Er : LiYF 4 crystal Intramolecular vibrational energy redistribution and intermolecular energy transfer in the (d, d) excited state of nickel octaethylporphyrin The photophysics of an amino-styrylbenzene dendrimer A-DSB system is probed by time-resolved and steady state luminescence spectroscopy. For two different generations of this dendrimer, steady state absorption, emission, and photoluminescence excitation spectra are reported and show that the efficiency of energy transfer from the dendrons to the core is very close to 100%. Ultrafast time-resolved fluorescence measurements at a range of excitation and detection wavelengths suggest rapid and hence efficient energy transfer from the dendron to the core. Ultrafast fluorescence anisotropy decay for different dendrimer generations is described in order to probe the energy migration processes. A femtosecond timescale fluorescence depolarization was observed with the zero and second generation dendrimers. Energy transfer process from the dendrons to the core can be described by a Fö rster mechanism hopping dynamics while the interbranch interaction in A-DSB core was found to be very strong indicating the crossover to exciton dynamics.

Photophysical Model of 10-Hydroxybenzo[h]quinoline: Internal Conversion and Excited State Intramolecular Proton Transfer

“…TRFS were obtained directly without the conventional spectral reconstruction. [26][27][28] SFG between the fluorescence and gate pulses was performed in a 300 μm thick BBO crystal by controlling the phase matching angle of the BBO crystal, detection wavelength of the monochromator (SP300, Acton research) and the time delay stage (MTM200cc, Newport Inc.) synchronously. Group velocity dispersion (GVD) of the fluorescence collection and focusing optics, which is nonzero even with all reflective optics, and 1 mm thick fused silica window of the 100 mm sample flow cell was measured using a white light continuum.…”

Calculations of nonlinear wave-packet interferometry signals in the pump-probe limit as tests for vibrational control over electronic excitation transfer

“…5, lower panel͒ could however be isolated in fluorescence up-conversion measurements. 52 Despite their general similarity in form, the pump-probe difference and corresponding pump-probe signals in Fig. 5 are not constant multiples of each other, so the nuclear motion induced by the control pulse evidently affects to some degree the wave-packet surface-crossing dynamics in the one-exciton manifold.…”

Ring Closure Reaction Pathway of a Diarylethene in Solution Using Femtosecond Time‐resolved Fluorescence Spectra

“…TF signals were measured by employing a fluorescence upconversion technique . The laser system is based on a home‐built multipass amplifier operating at 10 kHz and a noncollinear optical parametric amplifier (NOPA) tunable across the visible range.…”

“…[29][30][31][32] The laser system is based on a home-built multipass amplifier operating at 10 kHz and a noncollinear optical parametric amplifier (NOPA) tunable across the visible range. [29][30][31][32] The laser system is based on a home-built multipass amplifier operating at 10 kHz and a noncollinear optical parametric amplifier (NOPA) tunable across the visible range.…”