Volume 104, Number 2, October 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||20 November 2013|
Pressure dependence of singlet and triplet excitons in amorphous polymer semiconductors
1 Department of Physics and Astronomy, University of Missouri - Columbia, MO 65211, USA
2 Solid State and Structural Chemistry Unit, Indian Institute of Science - Bangalore 560012, India
3 Bergische Universität Wuppertal, Makromolekulare Chemie - Wuppertal, Germany
(b) firstname.lastname@example.org (corresponding author)
Received: 19 August 2013
Accepted: 16 October 2013
We present optical studies of both singlet and triplet states of a ladder-type conjugated polymer as a function of hydrostatic pressure. The pressure coefficient of the triplet-triplet absorption is smaller compared to the pressure coefficient of the singlet excitation, highlighting the more localized nature of triplet excitons. The photoluminescence and phosphorescence energies red-shift at similar rates with increasing pressure, thus giving experimental evidence for the first time that the singlet-triplet splitting remains almost a constant under high pressure until 4 GPa. The diffusion length of the triplet excitons decreases to a few hundred nm at high pressures, as compared with a few micrometers at atmospheric pressure.
PACS: 78.55.Kz – Solid organic materials / 62.50.-p – High-pressure effects in solids and liquids / 36.20.Kd – Electronic structure and spectra
© EPLA, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.