Fluorescence of isolated polydiacetylene chains in their monomer crystal is studied. Two different resonant emissions are observed. One is the weak emission of the free exciton at 1.9 eV at 10 K. The other is a very narrow (1.5 meV FWHM) intense resonance emission line at 2.28 eV and originates from a small fraction of chains with different conformation. Instantaneous exciton self-trapping is inconsistent with these emissions. The large difference in quantum yields (factor >10²) indicates that electronic relaxation of these chains is very sensitive to changes in chain conformation.
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Lécuiller et al. (1998) studied this question.
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