Fs-dynamics of charge-transfer excited states in anthracene–PMDA single crystals

Port, H.; Hartschuh, A.

doi:10.1016/j.jlumin.2004.08.027

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…For these D–A systems, many works have been carried out to capture the CT intermediates and obtained some information about the dynamic processes by means of time-resolved transient absorption, , emission, , Raman, − and other techniques, so as to further understand the nature of CT state. The intermolecular CT between the electron donor and electron acceptor in solution has been studied and reported a lot. , However, the electronic interactions between the donor and acceptor in the cocrystals are not deeply explored because of the technical limitations. − However, it is a big challenge to characterize and explore the excited states of solid state because there are multiple influence factors to the properties of excited state of solid state, such as intermolecular CT, hydrogen bond, π–π stacking, van der Waals force, and so forth. The motivation here is that we want to explore the excited states and its dynamics in the solid state by ultrafast time-resolved spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Insight into Intermolecular Charge Transfer Determined by Two Packing Mode Cocrystals

Sun

Pang

et al. 2020

J. Phys. Chem. C

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Cocrystal molecules obtained through simple self-assembly of small organic molecules often have unique properties that monomolecular crystals do not have. However, it is not easy to purposefully construct a series of cocrystals with specific functions. Moreover, the structures and dynamics of cocrystals are still riddles on account of the initial stage of cocrystal development. In this work, two electron donors (hexamethylbenzene and 1,3,5-trimethoxybenzene) are selected to govern the degree of charge transfer (CT) between the donor and acceptor (pyromellitic dianhydride), which may help obtain two light-emitting materials. In comparison with the monocomponent crystals, the emitting wavelengths of these cocrystals redshift from the ultraviolet range to visible region. It is worth noting that the intermolecular CT of these cocrystal materials is probed by femtosecond transient absorption (fs-TA) spectrometry. The relationship between the characteristics of emission and the stacking patterns of two specific cocrystals has been explored by fs-TA and density functional theory simulation. This work established the foundation to trace the excited-state evolution channels of the organic cocrystal materials.

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Section: Introductionmentioning

confidence: 99%

Insight into Intermolecular Charge Transfer Determined by Two Packing Mode Cocrystals

Sun

Pang

et al. 2020

J. Phys. Chem. C

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“…Crystal quality and narrow line width facilitate such studies, and samples of An−PMDA that do not resolve the ZPL in reflectance show electroreflectance spectra with strongly reduced amplitude . Transient absorption spectroscopy confirmed the CT exciton as coherent eigenstate but did not support the interesting idea of exciton strings conjectured from earlier pump−probe experiments …”

Section: Introductionmentioning

confidence: 78%

Stark Effect of Intrinsic and Extrinsic Charge-Transfer Excitons in a Linear Donor−Acceptor Stack: Anthracene−Pyromellitic Dianhydride

Weiser

Elschner

2009

J. Phys. Chem. A

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Anthracene-PMDA single crystals display at 2K about 70 meV below a well-known intrinsic charge-transfer exciton three narrow absorption lines, which are attributed to CT excitons bound to defects of a few 10(-5) concentration. All excitons respond very sensitively to electric fields along the molecular stack because of the large dipole moment, about 2 eA, of an ionized donor-acceptor pair, but only intrinsic excitons observe an optical selection rule. Although the triclinic unit cell contains only one pair of molecules, excitons appear in field-modulated spectra as near-degenerate doublets of different parity with very small splitting. The line shape of the EA spectra and selection rules with respect to the polarization of light and orientation of the field are consistent with the inversion symmetry of the lattice and the molecules. The simple crystal structure enables identification of the defects that are responsible for extrinsic excitons. Symmetry consideration based on translation invariance lead to a new interpretation of intrinsic excitons as true crystal states with charge transfer from the donor to the acceptor sublattice.

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“…The homogeneous linewidth was introduced by providing the frequency with an imaginary part d ¼ 2 cm À1 , obtained from experimental studies of the well known CT-crystal anthracene-PMDA (see Refs. [1,15,11,8,17]). …”

Section: Parameter Valuesmentioning

confidence: 99%

Donor–acceptor molecular aggregates: Vibronic spectra of mixed Frenkel and charge-transfer excitons

Warns

Lalov

Reineker

2009

Journal of Luminescence

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Fs-dynamics of charge-transfer excited states in anthracene–PMDA single crystals

Cited by 10 publications

References 23 publications

Insight into Intermolecular Charge Transfer Determined by Two Packing Mode Cocrystals

Insight into Intermolecular Charge Transfer Determined by Two Packing Mode Cocrystals

Stark Effect of Intrinsic and Extrinsic Charge-Transfer Excitons in a Linear Donor−Acceptor Stack: Anthracene−Pyromellitic Dianhydride

Donor–acceptor molecular aggregates: Vibronic spectra of mixed Frenkel and charge-transfer excitons

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