Control of luminescence in conjugated polymers through control of chain microstructure

W. James Feast, Franco Cacialli, Alex T H Koch, Rusli Daik, Christine Lartigau, Richard H. Friend, David Beljonne, Jean Luc Brédas

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The development of semiconducting polymers with high solid-state luminescence efficiencies has enabled the fabrication of efficient polymer light-emitting diodes. Luminescence is often quenched in well-ordered molecular solids, as a result of inter-molecular dipolar coupling, and the general observation of efficient luminescence in semiconducting polymers is unexpected. We report here the synthesis and characterisation of a series of model 'glassy' poly(arylenevinylene)s where we control the cis to trans ratio about the vinylene linkage and also the phenylene linkage geometry. Photoluminescence efficiency is enhanced for more disordered materials, with highest values for 50: 50 cis: trans ratios, when it exceeds 50%. We also find that the free volume associated with these glassy disordered polymers allows conformational relaxation of the excitonic state, via ring rotation at the vinylene linkage, causing a large Stokes' shift of the emission. We propose that high luminescence efficiency in these glassy polymers is due to emission from the more disordered regions, and that two effects due to disorder are simultaneously required: firstly that these regions are luminescent (prevention of aggregation by disorder), and, secondly, that the electronic excited state (exciton) can lower its energy below its value in more ordered regions by means of the ring-rotational coupling.

Original languageEnglish
Pages (from-to)907-912
Number of pages6
JournalJournal of Materials Chemistry
Volume17
Issue number9
DOIs
Publication statusPublished - 2007
Externally publishedYes

Fingerprint

Conjugated polymers
Luminescence
luminescence
Semiconducting polymers
Polymers
microstructure
Microstructure
linkages
polymers
disorders
Free volume
Excited states
Excitons
rings
Light emitting diodes
Photoluminescence
Agglomeration
Fabrication
light emitting diodes
excitons

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Feast, W. J., Cacialli, F., Koch, A. T. H., Daik, R., Lartigau, C., Friend, R. H., ... Brédas, J. L. (2007). Control of luminescence in conjugated polymers through control of chain microstructure. Journal of Materials Chemistry, 17(9), 907-912. https://doi.org/10.1039/b615408p

Control of luminescence in conjugated polymers through control of chain microstructure. / Feast, W. James; Cacialli, Franco; Koch, Alex T H; Daik, Rusli; Lartigau, Christine; Friend, Richard H.; Beljonne, David; Brédas, Jean Luc.

In: Journal of Materials Chemistry, Vol. 17, No. 9, 2007, p. 907-912.

Research output: Contribution to journalArticle

Feast, WJ, Cacialli, F, Koch, ATH, Daik, R, Lartigau, C, Friend, RH, Beljonne, D & Brédas, JL 2007, 'Control of luminescence in conjugated polymers through control of chain microstructure', Journal of Materials Chemistry, vol. 17, no. 9, pp. 907-912. https://doi.org/10.1039/b615408p
Feast, W. James ; Cacialli, Franco ; Koch, Alex T H ; Daik, Rusli ; Lartigau, Christine ; Friend, Richard H. ; Beljonne, David ; Brédas, Jean Luc. / Control of luminescence in conjugated polymers through control of chain microstructure. In: Journal of Materials Chemistry. 2007 ; Vol. 17, No. 9. pp. 907-912.
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