liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Intra- and interchain luminescence in amorphous and semicrystalline films of phenyl-substituted polythiophene
Show others and affiliations
2001 (English)In: JOURNAL OF PHYSICAL CHEMISTRY B, ISSN 1089-5647, Vol. 105, no 32, 7624-7631 p.Article in journal (Refereed) Published
Abstract [en]

We report time-resolved photoluminescence (PL) measurements of spin-cast amorphous films of a regioregular polythiophene derivative poly[3-(4-octylphenyl)thiophene] and of annealed semicrystalline films of the same polymer with an interchain stacking distance of 5 Angstrom. Red-shifted PL appears at long delay times in both pristine and annealed films, which we assign to interchain aggregates populated by excitation energy migration. Aggregate luminescence in annealed films exhibits a pronounced vibronic structure indicating the coupling to a C=C bond stretch with a Huang-Rhys factor S = 2. Two types of aggregates are distinguished in annealed films: in a few picoseconds most excitations are trapped by aggregates with a large energy gap (about 1.83 eV) between the lowest excited singlet state and the ground state. Excitation energy is transferred or the aggregates relax structurally with a time constant of about 200 ps to aggregates with a smaller energy gap (about 1.75 eV). The radiative lifetime of aggregates with smaller energy gap is estimated to be about 35 ns, two times longer than that of aggregates with the larger energy gap. In spin-cast amorphous films, emission from intrachain singlet excitons has a longer lifetime than in annealed films and only high-energy-gap aggregates are populated.

Place, publisher, year, edition, pages
2001. Vol. 105, no 32, 7624-7631 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-47923DOI: 10.1021/jp010511nOAI: diva2:268819
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Inganäs, Olle
By organisation
The Institute of TechnologyBiomolecular and Organic Electronics
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 85 hits
ReferencesLink to record
Permanent link

Direct link