Hot luminescence intrans-polyacetylene: A picosecond time-resolved study

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Abstract
The picosecond time-resolved optical emission from cis- and trans-polyacetylene excited at 2.3 eV has been observed. The trans isomer shows an initial decay ≤5 psec followed by an exponential decay with a lifetime of 1200±150 psec at 10 K. The spectrum of the observed emission is well above the band edge. The long-lifetime component, which contains over 90% of the integrated intensity, is interpreted to be hot luminescence. The cis isomer has principally a fast decay with a lifetime ≤15 psec.