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UV spectra of polydiacetylene (PDA) chains in their monomer single crystal matrix show an absorption near 4 eV and above, predominantly polarized perpendicular to the chain direction. It is shown by combining absorption and electroabsorption studies that the spectrum corresponds to an excitonic transition. This exciton has polarizability and binding energy comparable to those of the well-known exciton...
The exciton in single polydiacetylene (PDA) chains in the red form dispersed in their single crystal monomer matrix has been studied. A one-dimensional (1D) band description is necessary to account for the optical properties of these chains, which behave as perfect 1D systems: the E -1/1 singularity at threshold in the exciton density of states and the T 1/2 ...
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