Exciton self-trapping in MEH-PPV films studied by ultrafast emission depolarization

✍ Scribed by Arvydas Ruseckas; Ifor D. W. Samuel

• Book ID: 104557841
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 148 KB
• Volume: 3
• Category: Article
• ISSN: 1862-6351
• DOI: 10.1002/pssc.200562715

✦ Synopsis

Abstract

Depolarization of the transient absorption with a time constant of <120 fs is observed in poly[2‐(2′‐ethylhexyloxy)‐5‐methoxy‐1,4‐phenylenevinylene] (MEH‐PPV) film. It is too fast to be explained by incoherent hopping. We attribute it to dynamic localization (self‐trapping) of the initially delocalized excitons driven by structural relaxation of excited segments. Implications for charge carrier photogeneration are briefly discussed. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)