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

Lekshmi Sudha Devi, Mohammad K. Al-Suti, Carsten Dosche, Muhammad S. Khan, Richard H. Friend, Anna Köhler

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number045210
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number4
DOIs
Publication statusPublished - Jul 25 2008

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Conjugated polymers
Excitons
Energy transfer
Superconducting transition temperature
energy transfer
transition temperature
excitons
Semiconducting organic compounds
polymers
Organic light emitting diodes (OLED)
organic semiconductors
Polymers
light emitting diodes
monomers
Monomers
disorders
Electrons
electronics
electrons
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Triplet energy transfer in conjugated polymers. I. Experimental investigation of a weakly disordered compound. / Sudha Devi, Lekshmi; Al-Suti, Mohammad K.; Dosche, Carsten; Khan, Muhammad S.; Friend, Richard H.; Köhler, Anna.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 4, 045210, 25.07.2008.

Research output: Contribution to journalArticle

Sudha Devi, Lekshmi ; Al-Suti, Mohammad 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 - Condensed Matter and Materials Physics. 2008 ; Vol. 78, No. 4.
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