Green emission from poly(fluorene)s: The role of oxidation

Autor:	Emmanuelle Hennebicq, Jean-Luc Brédas, Alexander Pogantsch, Egbert Zojer, Patricia Scandiucci de Freitas, David Beljonne, Ullrich Scherf, Emil List
Rok vydání:	2002
Předmět:	chemistry.chemical_classification Materials science Photoluminescence General Physics and Astronomy Polymer Fluorene Photochemistry Electrochemistry Excimer chemistry.chemical_compound Fluorenone chemistry Polymerization Copolymer Physical and Theoretical Chemistry
Zdroj:	TU Graz
ISSN:	1089-7690 0021-9606
Popis:	Poly(fluorene)-type materials are widely used in polymer-based light emitting devices. In their pristine state, they emit in the deep blue spectral region. During operation there appears, however, an additional emission peak at around 2.3 eV. This observation has usually been attributed to aggregate or excimer formation. Recently, it has been shown that photo- and/or electro-oxidation of poly(fluorene) chains resulting in ketonic defects (i.e., formation of fluorenone groups) can also be held responsible for emission in that spectral region. In this contribution, we apply quantum-chemical techniques to gain a detailed understanding of the optical properties of poly(fluorene)s containing ketonic defects. In particular, we compare model systems for poly(fluorene) with their ketone-containing counterparts, focusing on the influence of excited-state localization effects. The results of the theoretical calculations are confirmed by experimental investigations on statistical copolymers of fluorene and 9-fluorenone.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e8de7afc04c65b93e98cfc7f279b0cf https://doi.org/10.1063/1.1507106 Zobrazit plný text záznamu