Understanding the Nature of the States Responsible for the Green Emission in Oxidized Poly(9,9-dialkylfluorene)s: Photophysics and Structural Studies of Linear Dialkylfluorene/Fluorenone Model Compounds

Khai Leok Chan, Marc Sims, Sofia I Pascu, Marilù Ariu, Andrew B Holmes, Donal D C Bradley

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

Here, the optical properties of a series of structurally well-defined model compounds for oxidatively degraded poly(dialkylfluorenes) (PFs) are reported Specifically, linear compounds comprising one, two, or four dihexylfluorene (F) moieties together with one fluorenone (O) moiety placed either at the end or in the center of each chain (i.e., FO, FFO, FOF, FFOFF) are studied. The results support the recent observation that the photophysics of the fluorenone-centered "pentamer" (FFOFF) is most similar to that of oxidized PFs. They further demonstrate that molecule-molecule interaction is essential to activate the green emission band. Investigations by x-ray diffraction (XRD) identify the solid-state structure of a representative member of this class of compounds and reveal inter-molecular interaction through dipole-dipole coupling between neighboring fluorenone moieties.
Original languageEnglish
Pages (from-to)2147-2154
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number13
DOIs
Publication statusPublished - 10 Jul 2009

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