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Triplet energy transfer in conjugated polymers. I. Experimental investigation of a weakly disordered compound

Title data

Devi, Lekshmi Sudha ; Al-Suti, Mohammed K. ; Dosche, Carsten ; Khan, Muhammad S. ; Friend, Richard H. ; Köhler, Anna:
Triplet energy transfer in conjugated polymers. I. Experimental investigation of a weakly disordered compound.
In: Physical Review B. Vol. 78 (25 July 2008) . - 045210.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.78.045210

Abstract in another language

Efficient triplet exciton emission has allowed improved operation of organic light-emitting diodes (LEDs). To enhance the device performance, it is necessary to understand what governs the motion of triplet excitons through the organic semiconductor. Here, we have investigated triplet diffusion using a model compound that has weak energetic disorder. The Dexter-type triplet energy transfer is found to be thermally activated down to a transition temperature TT, below which the transfer rate is only weakly temperature dependent. We show that above the transition temperature, Dexter energy transfer can be described within the framework of Marcus theory. We suggest that below TT, the nature of the transfer changes from phonon-assisted hopping to quantum-mechanical tunneling. The lower electron-phonon coupling and higher electronic coupling in the polymer compared to the monomer results in an enhanced triplet diffusion rate.

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 > 530 Physics
Date Deposited: 06 Mar 2015 16:13
Last Modified: 06 Mar 2015 16:13
URI: https://eref.uni-bayreuth.de/id/eprint/7926