Erratum: “Ultrafast polarized fluorescence dynamics in an organic dendrimer” [Appl. Phys. Lett. <b>77</b>, 1120 (2000)]

Varnavski, Oleg; Menkir, Getahun; Burn, Paul L.; Samuel, Ifor D. W.; Lupton, John M.; Beavington, R.

doi:10.1063/1.1377865

Cited by 10 publications

(20 citation statements)

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“…[29][30][31] The specific structure of electronic interactions associated with metasubstitutions on a phenyl ring results in fairly different spectroscopic units in the ground-and excited-state configurations with excitations localized on a single tolane segment in the ground-state geometry [29][30][31] (which is relevant for instantaneous TPA). Comparison with our results shows (in line with previous investigations [1][2][3][4][5][6][32][33][34]41,47,48,101 ) that the nitrogen branching center is very beneficial for the extended delocalization and enhanced TPA.…”

Section: Discussionsupporting

confidence: 94%

“…This is an indication of strong interbranch coupling and most probably strong electronic correlations through the branching nitrogen center, so the excitation extends beyond the linear (LB) unit as was observed for many other nitrogen-cored trimers. 1,2,5,6,27,33,47,48 The fluorescence spectrum of G0 is also shifted to the red with respect to the fluorescence spectrum of LB by approximately the same amount as for the absorption spectrum shift. It is wellestablished that for small branched molecules possessing chargetransfer character of the excited state the emitting state is localized on a single branch which is accompanied by the breaking of the molecular symmetry.…”

Section: Resultsmentioning

confidence: 94%

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Strongly Interacting Organic Conjugated Dendrimers with Enhanced Two-Photon Absorption

et al. 2006

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We report a strongly interacting new dendrimer system with an extended spectroscopic unit (coherent domain) beyond the trimer configuration. This report focuses on the mechanism of enhancement of the two-photon absorption (TPA) response of this material as a function of the dendrimer generation number. This enhancement is strongly correlated to the size and geometry of the spectroscopic unit in a strongly interacting macromolecular system. These systems are investigated by a wide variety of time-resolved spectroscopy methods including time-resolved fluorescence, transient absorption, three-pulse photon echo peak shift measurements as well as TPA cross section measurements. The extensive combination of modern spectroscopic methods strongly indicates that the spectroscopic unit (domain) in high generations covers the G1 (nine linear building blocks) and exceeds the trimer size.

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Section: Discussionsupporting

confidence: 94%

Section: Resultsmentioning

confidence: 94%

Strongly Interacting Organic Conjugated Dendrimers with Enhanced Two-Photon Absorption

et al. 2006

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“…A number of experimental and theoretical studies investigating exciton localisation have been carried out on branched molecules with different chemical structures, observing their fluorescence 14,15 or transient absorption. 16 The depolarisation of fluorescence also provides complementary information about energy transfer, as it shows the change in orientation of the emission dipole from the absorption dipole.…”

Section: Introductionmentioning

confidence: 99%

“…16 The depolarisation of fluorescence also provides complementary information about energy transfer, as it shows the change in orientation of the emission dipole from the absorption dipole. Molecules with a nitrogen core [14][15][16][17][18] show a very fast energy transfer between branches on a 30 fs time scale and subsequent localisation on one branch. 16 In contrast the molecules with benzene, [19][20][21] carbon and adamantine cores showed much slower depolarisation which implies that excitation localises quickly on one branch 20 and subsequently transfers to other branches via a Fo ¨rster mechanism.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of fluorescence depolarisation in star-shaped oligofluorene-truxene molecules

Montgomery

Hedley

Ruseckas

et al. 2012

Phys. Chem. Chem. Phys.

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Star-shaped molecules are of growing interest as organic optoelectronic materials. Here a detailed study of their photophysics using fluorescence depolarisation is reported. Fluorescence depolarisation dynamics are studied in branched oligofluorene-truxene molecules with a truxene core and well-defined three-fold symmetry, and are compared with linear fluorene oligomers. An initial anisotropy value of 0.4 is observed which shows a two-exponential decay with time constants of 500 fs and 3-8 ps in addition to a long-lived component. The femtosecond component is attributed to exciton localisation on one branch of the molecule and its amplitude reduces when the excitation is tuned to the low energy tail of the absorption spectrum. The picosecond component shows a weak dependence on the excitation wavelength and is similar to the calculated rate of the resonant energy transfer of the localised exciton between the branches. These assignments are supported by density-functional theory calculations which show a disorder-induced splitting of the two degenerate excited states. Exciton localisation is much slower than previously reported in other branched molecules which suggests that efficient light-harvesting systems can be designed using oligofluorenes and truxenes as building blocks.

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“…Preliminary results on the fluorescence anisotropy in G0 and G2 have been reported in our previous short communication. 45 Experimental florescence anisotropy R(t) was calculated from the decay curves for the intensities of fluorescence polarized parallel I par (t) and perpendicularly I per (t) to the polarization of the excitation light according to the equation…”

Section: Fluorescence Anisotropy Decay Measurementsmentioning

confidence: 99%

Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system

Varnavski

Samuel

Pålsson

et al. 2002

The Journal of Chemical Physics

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113

174

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Articles you may be interested inEnergy 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 J. Appl. Phys. 106, 103508 (2009) The photophysics of an amino-styrylbenzene dendrimer ͑A-DSB͒ 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 efficient͒ 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 time-scale 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 Förster mechanism ͑hopping dynamics͒ while the interbranch interaction in A-DSB core was found to be very strong indicating the crossover to exciton dynamics.

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Erratum: “Ultrafast polarized fluorescence dynamics in an organic dendrimer” [Appl. Phys. Lett. 77, 1120 (2000)]

Abstract: The dependence of the ultrafast relaxation kinetics of the S 2 and S 1 states in β -carotene homologs and lycopene on conjugation length studied by femtosecond time-resolved absorption and Kerr-gate fluorescence spectroscopies

Cited by 10 publications

References 0 publications

Strongly Interacting Organic Conjugated Dendrimers with Enhanced Two-Photon Absorption

Strongly Interacting Organic Conjugated Dendrimers with Enhanced Two-Photon Absorption

Dynamics of fluorescence depolarisation in star-shaped oligofluorene-truxene molecules

Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system

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