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Triplet–Triplet Annihilation in a Series of Poly(p-phenylene) Derivatives

Title data

Hoffmann, Sebastian T. ; Koenen, Jan-Moritz ; Scherf, Ullrich ; Bauer, Irene ; Strohriegl, Peter ; Bässler, Heinz ; Köhler, Anna:
Triplet–Triplet Annihilation in a Series of Poly(p-phenylene) Derivatives.
In: The Journal of Physical Chemistry B. Vol. 115 (2011) Issue 26 . - pp. 8417-8423.
ISSN 1520-5207
DOI: https://doi.org/10.1021/jp202763e

Official URL: Volltext

Abstract in another language

We have studied the temperature dependence of phosphorescence (Ph) and delayed fluorescence (DF) in two series of poly(p-phenylene) derivatives within a temperature range from 10 to 300 K under quasi-stationary conditions. One set of materials consists of the dimer, trimer, and polymer of ethylhexyl-substituted poly(fluorene) (PF2/6) and thus allows us to assess the effects of oligomer length. The second series addresses the influence of energetic disorder and conjugation length by being composed of the polymers alkoxy-substituted poly(p-phenylene) (DOO-PPP), poly(indenofluorene) (PIF), and ladder-type poly(p-phenylene) (MeLPPP). Under low light intensities, the DF features a maximum at a certain temperature Tmax. For the dimer and trimer, the Tmax coincides with the temperature at which the phosphorescence has decayed to 1/2 of the value at 10 K, while Tmax shifts to lower temperature values along the series DOO-PPP, PIF, and MeLPPP and approaches T = 0 K for MeLPPP. By applying conventional kinetic equations we show that the occurrence of a maximum in the DF intensity is the consequence of generalized thermally activated triplet exciton transport toward quenching sites. We find the quenching rates at 0 K to be in the range of 1 s–1 for the polymers, while they are more than an order of magnitude lower for the oligomers.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 530 Physics
Date Deposited: 13 Feb 2015 12:13
Last Modified: 13 Feb 2015 12:13
URI: https://eref.uni-bayreuth.de/id/eprint/6723