Luminescence of a Fully Polymerized Polydiacetylene
Photo-induced absorption, bleaching and luminescence spectra of conjugated polymers have been extensively studied in order to determine the nature of photo-excited states in these materials [1–3]. The literature on polydiacetylenes (PDAs) is less extensive. Photo-induced absorption (PIA) has been observed at 1.35eV for crystalline bis-p(toluene sulphonate) substituted polymer (PDA-TS) [4,5]. The PIA linewidth correlates with crystal quality for PDA-TS being 0.03eV for single crystals and 0.1eV for polycrystals. Bleaching of the 2eV exciton absorption has been observed for 2.32eV irradiation , which also produces PIA at 1.35eV. The higher efficiency for PIA production for excitation at 3.48eV, above the band gap at 2.45eV, and the observation of carrier generation from impurity states below the band gap  suggest that the PIA is produced by either self- or defect-trapped carriers.
KeywordsImpurity State Luminescence Decay Solid State Phys Streak Camera Laser Excitation Pulse
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