Erratum: Ultrafast optical studies of ordered poly(3-thienylene-vinylene) films [Phys. Rev. B<b>85</b>, 235201 (2012)]

Olejnik, Ella; Pandit, Bill; Basel, Tek; Lafalce, Evan; Sheng, C.-X.; Zhang, C.; Jiang, Xiaomei; Vardeny, Z. Valy

doi:10.1103/physrevb.86.199903

Cited by 10 publications

(33 citation statements)

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“…In this picture PA 2 band may be a transition from the 1B u to another, higher two-photon state, so called kA g [26][27][28]. Although the exciton in t-(CH) x has characteristic PA bands similar to many other polymers in the π-conjugated polymer family, it is still unique because the photogenerated 1B u exciton decays within ~100 fs to a "dark", lower lying exciton (so called 2A g state) that is nonradiative [29][30][31][32][33][34]. The transient PM spectra and decay dynamics clearly show that the generation of 2A g exciton is at the expense of 1B u exciton.…”

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confidence: 99%

“…The transient PM spectra and decay dynamics clearly show that the generation of 2A g exciton is at the expense of 1B u exciton. Importantly, the 2A g , which is the lowest two-photon state, occurs below the 1B u in most non-luminescent polymers [29][30][31][32][33][34][35];…”

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confidence: 99%

“…The energy diagram model of charge polaron in the gap, and related optical transitions are well known in the literature as shown in Fig. 3(b) [8,10,13,19,29]. Following this model the energy difference between the polymer HOMO and LUMO may be estimated from the relation: E g = 2P 1 + P 2 .…”

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Ultrafast Transient Spectroscopy of Trans -Polyacetylene in the Midinfrared Spectral Range

et al. 2020

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Trans-polyacetylene, (t-(CH) x) possesses twofold ground state degeneracy. Using the SSH Hamiltonian it was predicted that charged solitons are the primary photoexcitations in t-(CH) x ; this, however has led to sharp debate. To resolve this saga we have used sub-picosecond transient photomodulation spectroscopy in the mid-IR spectral range (0.1-1.5 eV) in neat t-(CH) x thin films. We show that odd parity singlet excitons are the primary photoexcitations in t-(CH) x , similar to many other non-degenerate π-conjugated polymers. The exciton transitions are characterized by two photoinduced absorption (PA) bands at 0.38 eV and 0.6 eV, and associated photoluminescence band at ~1.5 eV having similar polarization memory. The primary excitons undergo internal conversion within ~100 fs to an even-parity (dark) singlet excitons with PA band at ~1.4 eV. We have also found ultrafast photogeneration of charge polarons when pumping deep into the polymer continuum band, which are characterized by two other PA bands in the mid-IR and associated photoinduced IR vibrational modes.

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Ultrafast Transient Spectroscopy of Trans -Polyacetylene in the Midinfrared Spectral Range

et al. 2020

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“…The absorption spectrum is broad with an absorption maximum at 560 nm, similar to previously reported results 9. It has been reported that P3HTV films are almost non‐fluorescent with a fluorescence quantum efficiency less than 0.02 %, presumably owing to the of 2 1 A g symmetry of the lowest‐lying excited state,10 from which the electronic transition to the 1 1 A g ground state is forbidden. However, we found that the fluorescence intensity of a film of concentrated rra‐P3HTV embedded in a poly(methyl methacrylate) (PMMA) matrix (rra‐P3HTV/PMMA film hereafter) is much brighter than that of the pure rra‐P3HTV film under 488 nm Ar ion laser excitation in a wide‐field fluorescence microscope (Figure S2 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Effect of the Side‐Chain‐Distribution Density on the Single‐Conjugated‐Polymer‐Chain Conformation

Adachi

Lee

et al. 2013

ChemPhysChem

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The spatial arrangement of the side chains of conjugated polymer backbones has critical effects on the morphology and electronic and photophysical properties of the corresponding bulk films. The effect of the side-chain-distribution density on the conformation at the isolated single-polymer-chain level was investigated with regiorandom (rra-) poly(3-hexylthiophene) (P3HT) and poly(3-hexyl-2,5-thienylene vinylene) (P3HTV). Although pure P3HTV films are known to have low fluorescence quantum efficiencies, we observed a considerable increase in fluorescence intensity by dispersing P3HTV in poly(methyl methacrylate) (PMMA), which enabled a single-molecule spectroscopy investigation. With single-molecule fluorescence excitation polarization spectroscopy, we found that rra-P3HTV single molecules form highly ordered conformations. In contrast, rra-P3HT single molecules, display a wide variety of different conformations from isotropic to highly ordered, were observed. The experimental results are supported by extensive molecular dynamics simulations, which reveal that the reduced side-chain-distribution density, that is, the spaced-out side-chain substitution pattern, in rra-P3HTV favors more ordered conformations compared to rra-P3HT. Our results demonstrate that the distribution of side chains strongly affects the polymer-chain conformation, even at the single-molecule level, an aspect that has important implications when interpreting the macroscopic interchain packing structure exhibited by bulk polymer films.

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“…We have measured ultrafast dynamics of the primaryphotoexcitations in four typical polymers that represent both degenerate and non-degenerate ground state polymers. This includetrans-polyacetylene (DGS, low intrinsic PL efficiency) [44], polyfluorene (NDGS, high PL efficiency) [16], DPA (DGS, high PL efficiency) [45], and regio-random poly (thienylene-vinylene) (NDGS, low intrinsic PL efficiency) [46]. In all of these polymers, theexciton is the primary photoexcitation when the laser excitation photon energy is close to the absorption onset of polymers; in all casesexcitonic transition such as PA 1 is observed in the transient PM spectroscopy, havingdifferent dynamics.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast photomodulation spectroscopy of π-conjugated polymers, nanotubes and organometal trihalide perovskites: A comparison

et al. 2016

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Erratum: Ultrafast optical studies of ordered poly(3-thienylene-vinylene) films [Phys. Rev. B85, 235201 (2012)]

Cited by 10 publications

References 0 publications

Ultrafast Transient Spectroscopy of Trans -Polyacetylene in the Midinfrared Spectral Range

Ultrafast Transient Spectroscopy of Trans -Polyacetylene in the Midinfrared Spectral Range

Effect of the Side‐Chain‐Distribution Density on the Single‐Conjugated‐Polymer‐Chain Conformation

Ultrafast photomodulation spectroscopy of π-conjugated polymers, nanotubes and organometal trihalide perovskites: A comparison

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