Raman antenna effect from exciton–phonon coupling in organic semiconducting nanobelts

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU126091" target="_blank" >RIV/00216305:26210/17:PU126091 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/C7NR07212K" target="_blank" >http://dx.doi.org/10.1039/C7NR07212K</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/C7NR07212K" target="_blank" >10.1039/C7NR07212K</a>

Result language

angličtina

Original language name

Raman antenna effect from exciton–phonon coupling in organic semiconducting nanobelts

Original language description

The highly anisotropic interactions in organic semiconductors together with the soft character of organic materials lead to strong coupling between nuclear vibrations and exciton dynamics, which potentially results in anomalous electrical, optical and optoelectrical properties. Here, we report on the Raman antenna effect from organic semiconducting nanobelts 6,13-dichloropentacene (DCP), resulting from the coupling of molecular excitons and intramolecular phonons. The highly ordered crystalline structure in DCP nanobelts enables the precise polarization-resolved spectroscopic measurement. The angle-dependent Raman spectroscopy under resonant excitation shows that all Raman modes from the skeletal vibrations of DCP molecule act like a nearly perfect dipole antenna IRaman ∝ cos4(θ - 90), with almost zero (maximum) Raman scattering parallel (perpendicular) to the nanobelt's long-axis. The Raman antenna effect in DCP nanobelt is originated from the coupling between molecular skeletal vibrations and intramolecular exciton and the confinement of intermolecular excitons. It dramatically enhances the Raman polarization ratio (ρ = I‖/I⊥ > 25) and amplifies the anisotropy of the angle-dependent Raman scattering (κRaman = Imax/Imin > 12) of DCP nanobelts. These findings have crucial implications for fundamental understanding on the exciton–phonon coupling and its effects on the optical properties of organic semiconductors.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

NANOSCALE

ISSN

2040-3364

e-ISSN

2040-3372

Volume of the periodical

9

Issue of the periodical within the volume

48

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

19328-19336

UT code for WoS article

000418098000039

EID of the result in the Scopus database

2-s2.0-85038435116