Effects of molecular shape on the photoluminescence of dyes embedded in a chiral polymer with a photonic band gap

  • K. Bjorknas
  • P. Raynes
  • S. Gilmour


Circularly polarized photoluminescence has been generated by embedding fluorescent guest molecules in a helically aligned polymer host with a selective reflection band, which coincides with the emission wavelength of the embedded dyes. We have investigated the photoluminescence from a range of guest molecules of varying shapes and found that one circular polarization is suppressed within the reflection band of the host independently of the shape of the guest molecules. However, just outside the band edges, there is an enhancement of the same polarization and the relative magnitudes of the enhancement at the two band edges is strongly influenced by the shape of the guest molecules. This effect has been understood from the ordering of the guest molecules in the polymer host.


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  1. 1.
    E. Yablonovitch, Phys. Rev. Lett. 58 (1987) 2059.Google Scholar
  2. 2.
    S. V. Gaponenko, V. N. Bogomolov, E. P. Petrov, A. M. Kapitonov, A. A. Eychmueller, A. L. Rogach, I. I. Kalosha, F. Gindele and U. Woggon, J. Lumin. 87–89 (2000) 152.Google Scholar
  3. 3.
    H. Takezone, Y. Ouchi, A. Sugita, M. Hara, A. Fukuda and E. Kuze, Jn. J. Appl. Phys. 21 (1982) L390.Google Scholar
  4. 4.
    L. S. Goldberg and J. M. Schnur, US Patent 3 771 065 (1973).Google Scholar
  5. 5.
    I. P. Il'Chishin, E. A. Tikhonov, V. G. Tishchenko and M. T. Shpak, JETP Lett. 32 (1980) 24.Google Scholar
  6. 6.
    R. Dreher and H. Schomburg, Chem. Phys. Lett. 25 (1974) 527.Google Scholar
  7. 7.
    M. Hara, H. Takezoe, A. Fukuda, E. Kuze, Y. Kaizu and H. Kobayashi, Mol. Cryst. Liq. Cryst. 116 (1985) 253.Google Scholar
  8. 8.
    S. H. Chen, D. Katsis, A. W. Schmid, J. C. Mastrangelo, T. Tsutsui and T. N. Blanton, Nature 396 (1999).Google Scholar
  9. 9.
    K. Bjorknas, E. P. Raynes and S. Gilmour, Proc. SPIE 4464 (2001) 122.Google Scholar
  10. 10.
    M. Voigt, M. Chambers and M. Grell, Chem. Phys. Lett. 347 (2001) 173.Google Scholar
  11. 11.
    A. Dahlgren, “Optical Investigations of Chiral Liquid Crystals”, Thesis, Chalmers University of Technology (2000).Google Scholar
  12. 12.
    P. Yeh and C. Gu, “Optics of Liquid Crystal Displays” (John Wiley & Sons, 1999).Google Scholar
  13. 13.
    S. Chandrasekhar, “Liquid Crystals” (Cambridge University Press, 1994).Google Scholar
  14. 14.
    T. Tsutsui, N. Takada and S. Saito, Appl. Phys. Lett. 65 (1994) 1868.Google Scholar

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© Kluwer Academic Publishers 2003

Authors and Affiliations

  • K. Bjorknas
    • 1
  • P. Raynes
    • 1
  • S. Gilmour
    • 2
  1. 1.Department of Engineering ScienceUniversity of OxfordOxfordUK
  2. 2.Sharp Laboratories of Europe LtdOxfordUK

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