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
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
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