Abstract
Exciton transition energies and temperature dependence of ultrafast relaxation processes have been investigated in polydiacetylene (PDA-(12,8) Langmuir-Blodgett films with several exciton transition energies using femtosecond absorption spectroscopy. The relaxation from self-trapped exciton to the ground state in PDA with 1.88 eV exciton energy is faster than that relaxation in PDA with larger exciton energy. The decay kinetics in PDAs can be explained in terms of tunneling in the configuration space from the self-trapped exciton to the ground state.
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