Luminescence from Aromatic Polymers, Monomers, and Dimers under High-Energy Electron Excitation

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Abstract
The luminescencespectra of various polymers and solid‐model compounds induced by 1‐MeV electrons are reported and interpreted. The presence of enhanced triplet emission and absence of singlet emission from poly(p‐xylene), poly(monochloro‐p‐xylene), and the model compound dibenzyl are interpreted on the basis of a molecular resonance model. Some triplet excimer and other long‐wavelength (450–550‐mμ) emission were also observed in these spectra. The spectra of the monomersp‐xylene and 2‐chloro‐p‐xylene consisted primarily of long‐wavelength emission (400–600 mμ), while the spectra of frozen toluene and durene exhibited both neutral molecule singlet and the long‐wavelength emission. Benzene exhibited only singlet, singlet excimer, triplet, and triplet excimer emission. The polymers poly(ethylene‐2,6‐naphthalene‐dicarboxylate), poly(ethyleneterephthalate), and polysulfone emitted primarily from singlet and singlet excimer states. The model compounds for these polymers, dimethyl‐2,6‐naphthalenedicarboxylate, dimethylterephthalate, and methyl‐p‐toluenesulfonate exhibited varying amounts of singlet, triplet, excimer, and neutral or ionic radical emission.