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2007 | 5 | 4 | 923-930
Tytuł artykułu

Energy up-conversion in dilute polyfluorene solutions

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Poly(9,9-dioctylfluorene) (PFO) shows highly efficient blue emission with photo excitation occurring between 340–400 nm. Here we show that PFO can in dilute solution emit at a wavelength well below that at which it is being exited. This, we propose is related to an energy transfer from conjugated parts of the polymer chain into more localised states which then emit at a lower wavelength. These localised states can be considered as defects in the conjugation of the polymer or as chain ends. These may produce quasi monomer or quasi dimer species within the chain, which will have a HOMO-LUMO gap of higher energy than the conjugated polymer. These then fluoresce at the lower wavelength; essentially causing, by energy transfer, a process of energy up-conversion. [...]
Wydawca

Czasopismo
Rocznik
Tom
5
Numer
4
Strony
923-930
Opis fizyczny
Daty
wydano
2007-12-01
online
2007-12-01
Twórcy
  • The Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, G1, 1XL, Glasgow, UK, alexander.kuhne@strath.ac.uk
  • The Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, G1, 1XL, Glasgow, UK
  • The Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, G1, 1XL, Glasgow, UK
  • The Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, G1, 1XL, Glasgow, UK, r.a.pethrick@strath.ac.uk
Bibliografia
  • [1] J.H. Burroughes, D.D.C. Bradley, A.R. Brown, R.N. Marks, K. Mackay, R.H. Friend, P.L. Burn and A.B. Holmes: “Light emitting-diodes based on conjugated polymers”, Nature, Vol. 347, (1990), pp. 539–541. http://dx.doi.org/10.1038/347539a0[Crossref]
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  • [5] C. Chi, C. Im and G. Wegner: “Lifetime determination of fluorescence and phosphorescence of a series of oligofluorenes”, J. Chem. Phys., Vol. 124, (2006), art. 024907.
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  • [10] G. Klaerner and R.D. Miller: “Polyfluorene derivatives: Effective conjugation length from well defined oligomers”, Macromolecules, Vol. 31, (1998), pp. 2007–2009. http://dx.doi.org/10.1021/ma971073e[Crossref]
  • [11] L.-O. Pålsson, C.S. Wang, D.L. Russell, A.P. Monkman, M.R. Bryce, G. Rumbles and I.D.W. Samuel: “Photophysics of a fluorene co-polymer in solution and films”, Chem. Phys., Vol. 279, (2002), pp. 229–237. http://dx.doi.org/10.1016/S0301-0104(02)00407-X[Crossref]
  • [12] G. Fytas, H.G. Nothofer, U. Scherf, D. Vlassopoulos and G. Meier: “Structure and dynamics of nondilute polyfluorene solutions”, Macromolecules, Vol. 35, (2002), pp. 481–488. http://dx.doi.org/10.1021/ma011416f[Crossref]
  • [13] J. Duhamel, A. Yekta, M.A, Winnik, T.C. Jao, M.K. Mishra and I.D. Rubin: “A blob model to study polymer-chain dynamics in solution”, J. Phys. Chem., Vol. 97, (1993), pp. 13708–13712. http://dx.doi.org/10.1021/j100153a046[Crossref]
  • [14] W. Chunwaschirasiri, B. Tanto, D.L. Huber and M.J. Winokur: “Chain conformations and photoluminescence of poly(di-n-octylfluorene)”, Phys. Rev. Lett., Vol. 94, (2005), art. 107402.
  • [15] M. Annia, M.E. Caruso, S. Lattante and R. Cingolani: “The role of excitons’ quasiequilibrium in the temperature dependence of the poly,9,9-dioctylfluorene tphase photoluminescence”, J. Chem. Phys., Vol. 124, (2006), art. 134707.
  • [16] O. Worsfold, J. Hill, S.Y. Heriot, A.M. Fox, D.D.C. Bradley and T.H. Richardson: “Langmuir and Langmui-Blodgett (LB) film properties of poly(9,9-dioctylfluorene)”, Mater. Sci. Eng. C, Vol. 23, (2003), pp. 541–544.
  • [17] O. J. Korovyanko and Z.V. Vardeny: “Film morphology and ultrafast photoexcitation dynamics in polyfluorene”, Chem. Phys. Lett., Vol. 356, (2002), pp. 361–367. http://dx.doi.org/10.1016/S0009-2614(02)00349-4[Crossref]
  • [18] X. Gong, D. Moses, A.J. Heeger and S. Xiao: “Excitation energy transfer from polyfluorene to fluorene defects”, Synth. Met., Vol. 141, (2004), pp. 17–20. http://dx.doi.org/10.1016/j.synthmet.2003.06.003[Crossref]
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  • [20] T.P. Nguyen: “Defect analysis in organic semiconductors”, Mater. Sci. Semicond. Process, Vol. 9, (2006), pp. 198–203. http://dx.doi.org/10.1016/j.mssp.2006.01.060[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-007-0051-7
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