Exciton dynamics in pentacene thin films studied by pump-probe spectroscopy

✍ Scribed by C. Jundt; G. Klein; B. Sipp; J. Le Moigne; M. Joucla; A.A. Villaeys

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 452 KB
• Volume: 241
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(95)00603-2

✦ Synopsis

Pentacene microcrystalline thin films have been investigated by pump-probe spectroscopy in the femtosecond regime. The competition between induced absorption in the singlet S, + S, and triplet TI -+ T,, excited electronic configurations and bleaching of the S, + S, transition has been observed. A theoretical description is proposed to explain the experimental results. The importance of the different contributions associated with the various competing processes are stressed. A very fast triplet exciton creation with rate constant 1.3 X lOI s-l is attributed to a fission process from one S, exciton to a pair of lowest triplet T, excitons.