dc.contributor.author | Hayes, Sophia C. | en |
dc.contributor.author | Silva, C. | en |
dc.creator | Hayes, Sophia C. | en |
dc.creator | Silva, C. | en |
dc.date.accessioned | 2019-11-21T06:19:20Z | |
dc.date.available | 2019-11-21T06:19:20Z | |
dc.date.issued | 2010 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/55546 | |
dc.description.abstract | We present ultrafast transient absorption spectra of two oligofluorene derivatives in dilute solution. These spectra display a photoinduced absorption band with clear vibronic structure, which we analyze rigorously using a time-dependent formalism of absorption to extract the principal excited-state vibrational normal-mode frequencies that couple to the electronic transition, the configurational displacement of the higher-lying excited state, and the reorganization energies. We can model the excited-state absorption spectrum using two totally symmetric vibrational modes with frequencies 450 (dimer) or 400 cm-1 (trimer), and 1666 cm-1. The reorganization energy of the ground-state absorption is rather insensitive to the oligomer length at 230 meV. However, that of the excited-state absorption evolves from 58 to 166 meV between the oligofluorene dimer and trimer. Based on previous theoretical work [A. Shukla, Phys. Rev. B 67, 245203 (2003)], we assign the absorption spectra to a transition from the 1 Bu excited state to a higher-lying m A g state, and find that the energy of the excited-state transition with respect to the ground-state transition energy is in excellent agreement with the theoretical predictions for both oligomers studied here. These results and analysis permit profound understanding of the nature of excited-state absorption in π -conjugated polymers, which are the subject of general interest as organic semiconductors in the solid state. © 2010 American Institute of Physics. | en |
dc.source | Journal of Chemical Physics | en |
dc.source.uri | https://www.scopus.com/inward/record.uri?eid=2-s2.0-77953598973&doi=10.1063%2f1.3432602&partnerID=40&md5=4cdee28d534933f803d8aa9d3013d96b | |
dc.subject | Organic polymers | en |
dc.subject | Absorption | en |
dc.subject | Excited states | en |
dc.subject | Ultra-fast | en |
dc.subject | Absorption spectroscopy | en |
dc.subject | Ground state | en |
dc.subject | Light absorption | en |
dc.subject | Conjugated polymers | en |
dc.subject | Ground state absorption | en |
dc.subject | Vibronic structure | en |
dc.subject | Absorption spectra | en |
dc.subject | Dilute solution | en |
dc.subject | Electronic transition | en |
dc.subject | Excited state absorption | en |
dc.subject | Normal-mode frequencies | en |
dc.subject | Oligofluorenes | en |
dc.subject | Oligomer length | en |
dc.subject | Oligomers | en |
dc.subject | Organic semiconductor | en |
dc.subject | Photoinduced absorption | en |
dc.subject | Reorganization energies | en |
dc.subject | Theoretical prediction | en |
dc.subject | Time-dependent | en |
dc.subject | Totally symmetric | en |
dc.subject | Transient absorption spectra | en |
dc.subject | Vibrational modes | en |
dc.title | Analysis of the excited-state absorption spectral bandshape of oligofluorenes | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1063/1.3432602 | |
dc.description.volume | 132 | |
dc.description.issue | 21 | |
dc.author.faculty | 002 Σχολή Θετικών και Εφαρμοσμένων Επιστημών / Faculty of Pure and Applied Sciences | |
dc.author.department | Τμήμα Χημείας / Department of Chemistry | |
dc.type.uhtype | Article | en |
dc.description.notes | <p>Cited By :8</p> | en |
dc.source.abbreviation | J.Chem.Phys. | en |
dc.contributor.orcid | Hayes, Sophia C. [0000-0002-2809-6193] | |
dc.gnosis.orcid | 0000-0002-2809-6193 | |