Exciton transition energy and temperature dependence of ultrafast relaxation of self-trapped excitons in polydiacetylenes

✍ Scribed by Masayuki Yoshizawa; Katsuhiko Nishiyama; Masamichi Fujihira; Takayoshi Kobayashi

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 616 KB
• Volume: 207
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)89030-l

✦ Synopsis

Exciton transition energies and temperature dependence of ultrafast relaxation processes have been investigated in polydiaca tylene (PDA-( 12,8)) Langmuir-Blodgett films with several exciton transition energies using femtoseeond absorption speetroscopy. 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 tothe ground state.