Time-Resolved Polarization of Luminescence Spectroscopy: An Accurate and Versatile Digital Instrument for the Sub-μs Time Domain

Rexwinkel, Roel B.; Schakel, P.; Meskers, Stefan C. J.; Dekkers, Harry P. J. M.

doi:10.1366/0003702934067063

Cited by 28 publications

(20 citation statements)

References 12 publications

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“…All the annealed films were homogenous and when observed with an optical microscope with crossed polarizers possessed a Schlieren texture. UV-vis absorption spectra were recorded using a commercial spectrophotometer, except where absorptions exceeded 2, where they were estimated on an in-house assembly [18]. For films with ½A L ±A R ½ < 0.06, circular dichroism spectra were measured using a Jasco J-600 instrument.…”

Section: Methodsmentioning

confidence: 99%

“…For films with ½A L ±A R ½ < 0.06, circular dichroism spectra were measured using a Jasco J-600 instrument. For films with a high circular differential absorbance, we used a home-built setup incorporating a photoelastic modulator and a photon counting detection system [18]. Here, monochromated light of a Xe arc lamp was depolarized by passing it through an optical fiber and the circular polarization of the transmitted light was measured.…”

Section: Methodsmentioning

confidence: 99%

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The Chiroptical Properties of a Thermally Annealed Film of Chiral Substituted Polyfluorene Depend on Film Thickness

et al. 2003

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The synthesis of the azobenzene gelator has already been reported [10a]. To prepare a self-assembled cholesteric gel, a homogeneous mixture of BL006/ R811/gelator was obtained by first dissolving all compounds in a common solvent, tetrahydrofuran (THF), and then evaporating the solvent under reduced pressure. The mixture was flow-filled, at 130 C, into the 10 lm thick electrooptic cell, and subsequent fast cooling of the mixture to room temperature resulted in the gel sample with a uniform physical network built up from nanometer-sized hydrogen-bonded fibrous aggregates (Fig. 1a). To record a grating, a photomask was positioned on one side of the cell, and the whole was placed into a thermostat hot stage and heated to the recording temperature. A curing system (Novacure apparatus) was used to expose the sample to UV light centered at 360 nm. Once the irradiation was completed, the sample was cooled to room temperature, either under irradiation or with irradiation turned off. The gratings were observed on a polarizing optical microscope (Leitz DMR-P apparatus). For SEM observations of the aggregates, on a Hitachi S-4700 FEG SEM apparatus, the cell was carefully opened and the cholesteric LC host was extracted in hexane.For the measurements of the diffraction efficiency under an electric field, a He±Ne laser (633 nm) was used as the incident light source (normal to the cell) and the 1st order (+1) diffraction signal, I d , was monitored using a high-speed photodetector (Displaytech) collected to a digital oscilloscope (Tektronix, TDS 420 A apparatus). A high-voltage waveform generator (WFG500 apparatus, FLC Electronics) was used to apply the AC (1000 Hz), square wave, and pulse electric fields through the cell. The diffraction efficiency was calculated as the ratio of I d over the intensity of the laser beam before reaching the cell.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The Chiroptical Properties of a Thermally Annealed Film of Chiral Substituted Polyfluorene Depend on Film Thickness

et al. 2003

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“…CPL and lanthanide emission lifetimes were recorded on a home-built instrument described earlier. [19] Methods Circular polarization in absorption and emission: Values for electric and magnetic dipole moments can be obtained from quantitative analysis of absorption and circular dichroism spectra using Equations (1) and (2). [20] According to Equation (1) The circular dichroism depends on the relative magnitude and orientation of the electric and magnetic transition dipole moment.…”

Section: Methodsmentioning

confidence: 99%

Chiroptical Properties of an Optically Pure Dicopper(I) Trefoil Knot and Its Enantioselectivity in Luminescence Quenching Reactions

et al. 2000

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Chiroptical spectroscopy is used to investigate the properties of an optically pure dinuclear copper(I) trefoil knot. For the metal-to-ligand charge tranfer (MLCT) transition in the visible region (520 nm), the electric and magnetic transition dipole moments are determined from absorption and circular dichroism spectra: 2.8 Debye and 0.5 Bohr magneton (muB). Circular polarization in the luminescence (CPL) of the knot is determined and this allows the electric and magnetic transition dipole moments in emission to be calculated: 0.02 Debye and 0.003 muB. The large difference between the moments in absorption and emission shows that the emission observed does not originate directly from the 1MLCT state. Given the low probability for radiative decay we assign the long-lived emitting excited state to a 3MLCT state. The copper(I) trefoil knot is found to quench the emission from TbIII and EuIII(dpa)3(3)-(dpa = pyridine-2,6-dicarboxylate) with a bimolecular rate constant of 3.2 and 3.3 x 10(7)M(-1)S(-1), respectively, at room temperature in water-acetonitrile (1:1 by volume). Experimental results indicate that the (lambda)-knot preferentially quenches the lambda enantiomer of the lanthanide complex with an enantioselectivity (ratio of quenching rate constants for lambda and lambda: kqlambda/kqdelta) of 1.012+/-0.002 for EuIII and 1.0180+/-0.003 for TbIII.

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“…Two instruments have been described, which are characterized by maximum time resolutions of about 10 Very recently, a time resolved CPL spectrometer has been developed in which the time resolution scale has been considerably increased (having a span of 50 nsec to 100 seconds) . 16 These devices have proved useful in the study of excited-state energy transfer reactions.…”

Section: Instrumentationmentioning

confidence: 99%

Excited-state optical activity, 1987-1995

Brittain¹

1996

Chirality

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Time-Resolved Polarization of Luminescence Spectroscopy: An Accurate and Versatile Digital Instrument for the Sub-μs Time Domain

Cited by 28 publications

References 12 publications

The Chiroptical Properties of a Thermally Annealed Film of Chiral Substituted Polyfluorene Depend on Film Thickness

The Chiroptical Properties of a Thermally Annealed Film of Chiral Substituted Polyfluorene Depend on Film Thickness

Chiroptical Properties of an Optically Pure Dicopper(I) Trefoil Knot and Its Enantioselectivity in Luminescence Quenching Reactions

Excited-state optical activity, 1987-1995

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