The role of C-H and C-C stretching modes in the intrinsic non-radiative decay of triplet states in a Pt-containing conjugated phenylene ethynylene

Anna Köhler, Amena L T Khan, Joanne S. Wilson, Carsten Dosche, Mohammed K. Al-Suti, Hakikulla H. Shah, Muhammad S. Khan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The intrinsic non-radiative decay (internal conversion) from the triplet excited state in phosphorescent dyes can be described by a multi-phonon emission process. Since non-radiative decay of triplet excitons can be a significant process in organic light-emitting diodes, a detailed understanding of this decay mechanism is important if the overall device efficiency is to be controlled. We compare a deuterated Pt(II)-containing phenylene ethynylene with its non-deuterated counterpart in order to investigate which phonon modes control to the non-radiative decay path. We observe that deuteration does not decrease the non-radiative decay rate. A Franck-Condon analysis of the phosphorescence spectra shows that the electronic excitation is coupled strongly to the breathing mode of the phenyl ring and the CC carbon stretching modes, while high-energy C-H or C-D stretching modes play an insignificant role. We, therefore, associate the internal conversion process with the carbon-carbon stretching vibrations.

Original languageEnglish
Article number094905
JournalJournal of Chemical Physics
Volume136
Issue number9
DOIs
Publication statusPublished - Mar 7 2012

Fingerprint

atomic energy levels
Stretching
Carbon
internal conversion
decay
carbon
Phosphorescence
Organic light emitting diodes (OLED)
Excited states
Coloring Agents
phosphorescence
breathing
decay rates
excitation
light emitting diodes
dyes
excitons
vibration
rings
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

The role of C-H and C-C stretching modes in the intrinsic non-radiative decay of triplet states in a Pt-containing conjugated phenylene ethynylene. / Köhler, Anna; Khan, Amena L T; Wilson, Joanne S.; Dosche, Carsten; Al-Suti, Mohammed K.; Shah, Hakikulla H.; Khan, Muhammad S.

In: Journal of Chemical Physics, Vol. 136, No. 9, 094905, 07.03.2012.

Research output: Contribution to journalArticle

Köhler, Anna ; Khan, Amena L T ; Wilson, Joanne S. ; Dosche, Carsten ; Al-Suti, Mohammed K. ; Shah, Hakikulla H. ; Khan, Muhammad S. / The role of C-H and C-C stretching modes in the intrinsic non-radiative decay of triplet states in a Pt-containing conjugated phenylene ethynylene. In: Journal of Chemical Physics. 2012 ; Vol. 136, No. 9.
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