Author/Authors :
Lanzani، نويسنده , , G and Stagira، نويسنده , , S and Cerullo، نويسنده , , G and De Silvestri، نويسنده , , S and Comoretto، نويسنده , , D and Moggio، نويسنده , , I and Cuniberti، نويسنده , , C and Musso، نويسنده , , G.F and Dellepiane، نويسنده , , G، نويسنده ,
Abstract :
Results from femtosecond/picosecond transient absorption spectra measurements in the near-infrared/visible spectral region of the red form of a soluble polycarbazolyldiacetylene in a polyethylene matrix are reported. Intrachain singlet and triplet excitons are identified by the different dynamics of the photoinduced bands. The results are consistent with the ultrafast generation (<200 fs) of triplet pairs by fission of a singlet state located below the first optically allowed electronic state. In the picosecond time domain, triplet pairs undergo a random walk in a one-dimensional path with statistically distributed traps and partially dissociate into long-lived (≅150 μs) localized triplets.
