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Pressure dependence of singlet and triplet excitons in amorphous polymer semiconductors
- Source :
- EPL (Europhysics Letters). 104:27008
- Publication Year :
- 2013
- Publisher :
- IOP Publishing, 2013.
-
Abstract
- 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.
Details
- ISSN :
- 12864854 and 02955075
- Volume :
- 104
- Database :
- OpenAIRE
- Journal :
- EPL (Europhysics Letters)
- Accession number :
- edsair.doi...........635132c7a383703313affece75fb1d9a