An Alternative Interpretation for the Spectral Response of Self-Assembled Pseudoisocyanine J-Aggregates in Aqueous Solution

Date

2009-04-01

Author

Gulen, Demet

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

157
views

0
downloads

An alternative interpretation for the optical response of pseudoisocyanine J-aggregates is given on the basis of a recently suggested monomeric absorption spectrum exhibiting the seemingly universal spectral fingerprint of cyanines. Temperature-dependence of the generic J-aggregate absorption spectra reported in the literature is quantified by employing simulations obtained in the Frenkel exciton formalism augmented by diagonal energetic disorder and exciton-phonon coupling. It is concluded that the pseudoisocyanine J-aggegates are formed mainly through aggregation of precursor aggregates with absorption around 525 nm upon decrease of temperature and/or increase of dye concentration. This conclusion opposes the common view which attributes the formation of pseudoisocyanine J-aggregates to aggregation of precursors of H-aggregate in nature and to monomers. It is expected that a large number of observations on optical response, and aggregation kinetics, which are still debated on and have been forced to be reconciled in a self-consistent picture through a variety of assumptions, can find reasonable explanations within the alternative viewpoint promoted in this note.

Subject Keywords

Electrical and Electronic Engineering, General Materials Science, General Chemistry, Condensed Matter Physics, Computational Mathematics

URI

https://hdl.handle.net/11511/63636

Journal

JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE

DOI

https://doi.org/10.1166/jctn.2009.1115

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

The electronic structure of capped and uncapped CdS nanoparticles Ercan, Ilke; Katırcıoğlu, Şenay (American Scientific Publishers, 2008-02-01) The electronic structure of spherical CdmSn nanoparticles having zinc-blende symmetry and the diameters of up to around 3 nm has been studied by Hartree-Fock theory to find out the effect of the cluster size on the optical energy gap between HOMO and LUMO. The effect of encapsulation on the electronic structure has been also investigated for CdS4 and Cd13S4 clusters embedded in SiO2 matrix and sodalite cage by Hartree-Fock theory. It was found that the energy gap of CdS nanoparticles can be regulated by bot...
The electronic structure of a quantum well under an applied electric field Sari, H; Ergun, Y; Sokmen, I; Tomak, Mehmet (Elsevier BV, 1996-01-01) The effects of an applied electric field on quantum well subband energies are calculated variationally within the effective mass approximation for model potential profiles. The concept of a quasi-bound state is examined critically. For higher electric field values it is shown that the quasi-bound state approximation for the ground and first excited state of the electron, and for the ground state of the hole is valid. (C) 1996 Academic Press Limited
Optical anisotropy in GaSe Seyhan, A; Karabulut, O; Akınoğlu, Bülent Gültekin; Aslan, B; Turan, Raşit (Wiley, 2005-09-01) Optical anisotropy of the layer semiconductor GaSe has been studied by photoluminescence (PL) and Fourier Transform Infrared Spectroscopy (FTIR). The PL spectra are dominated by two closely positioned emission bands resulting from the free exciton and the bound exciton connected direct band edge of GaSe. Photoluminescence and transmission spectra of GaSe crystals have been measured for two cases in which the propagation vector k is perpendicular (k perpendicular to c) and parallel to the c-axis (k//c). Peak...
In vivo biosensing via tissue-localizable near-infrared-fluorescent single-walled carbon nanotubes Iverson, Nicole M.; Barone, Paul W.; Shandell, Mia; Trudel, Laura J.; Sen, Selda; Sen, Fatih; Ivanov, Vsevolod; Atolia, Esha; Farias, Edgardo; McNicholas, Thomas P.; Reuel, Nigel; Parry, Nicola M. A.; Wogan, Gerald N.; Strano, Michael S. (Springer Science and Business Media LLC, 2013-11-01) Single-walled carbon nanotubes are particularly attractive for biomedical applications, because they exhibit a fluorescent signal in a spectral region where there is minimal interference from biological media. Although single-walled carbon nanotubes have been used as highly sensitive detectors for various compounds, their use as in vivo biomarkers requires the simultaneous optimization of various parameters, including biocompatibility, molecular recognition, high fluorescence quantum efficiency and signal t...
Symmetry conditions for type II multiferroicity in commensurate magnetic structures Perez-Mato, J. M.; Gallego, S. V.; Elcoro, L.; Tasci, E.; Aroyo, M. I. (IOP Publishing, 2016-07-20) Type II multiferroics are magnetically ordered phases that exhibit ferroelectricity as a magnetic induced effect. We show that in single-k magnetic phases the presence in the paramagnetic phase of non-symmorphic symmetry combined with some specific type of magnetic propagation vector can be sufficient for the occurrence of this type of multiferroic behaviour. Other symmetry scenarios especially favourable for spin driven multiferroicity are also presented. We review and classify known type II multiferroics ...

Citation Formats

D. Gulen, “An Alternative Interpretation for the Spectral Response of Self-Assembled Pseudoisocyanine J-Aggregates in Aqueous Solution,” JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE, pp. 834–840, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/63636.