Abstract
Photoinduced infrared absorption and photoinduced electron spin resonance measurements on crystalline powders of polydiacetylenes are reported. The results imply long-lived, localized, charged, spinless photo-excitations. We have observed metastable photoinduced absorption from the vibrational modes (CC, CC) of the PDA backbone and an associated overlapping broad electronic transition (centered at a frequency which depends on the particular side chain). We conclude that bipolarons are created through interchain charge transfer and coexist with the intrachain singlet and triplet (neutral) excitons. Weak interchain hopping inhibits recombination and leads to metastable bipolarons (with lifetimes of order 30 minutes) at low temperatures.
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