Fabrication of α- and β-phase poly(9,9-dioctylfluorene) thin films

Azuma, Hironobu; Asada, Kohei; Kobayashi, Takashi; Naito, Hiroyoshi

doi:10.1016/j.tsf.2005.09.032

Cited by 35 publications

(23 citation statements)

References 7 publications

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“…4 in Supporting Information). This behavior parallels that in solution and is a consequence of increased absorption of the b-phase component with increase in the excitation wavelength [63].…”

Section: Fluorescence Spectra and Anisotropy Of Pf Filmssupporting

confidence: 66%

Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH–PPV and Poly(9,9′-dioctylfluorene-2,7-diyl)

Cossiello

Susman

Aramendı́a

et al. 2010

Journal of Luminescence

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Section: Fluorescence Spectra and Anisotropy Of Pf Filmssupporting

confidence: 66%

Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH–PPV and Poly(9,9′-dioctylfluorene-2,7-diyl)

Cossiello

Susman

Aramendı́a

et al. 2010

Journal of Luminescence

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“…[3] PF8 can also be prepared in a liquid crystal phase, and when aligned on a suitable rubbed surface, it can be used to generate polarized emission with a polarization ratio of 10 for photoluminescence (PL) and 25 for electroluminescence. [4,5] Furthermore, PF8 can be prepared in a range of morphological phases, including an amorphousphase, [6,7] a nematic liquid crystal-phase, a crystalline-phase [8] and a phase with extended chain conformation termed the b-phase. [3,5] Recent studies [9] have applied a clear nomenclature to the various phases of PF8 and demonstrate that there are 3 distinguishable classes of conformational isomers with different chain torsional angles.…”

Section: Introductionmentioning

confidence: 99%

“…[9,10] The a-phase can be created by spin-casting from toluene/THF, [6,9] the g-phase formed by thermal cycling above the melting point (430 K) [9] and the b-phase created by spin-casting from relatively poor solvents [7,9] or by thermal cycling [11,12] or exposure to solvent vapor. [1,6] This rich phase morphology provides a unique opportunity to study the influence of film structure on the photophysics of conjugated polymers without the need for chemical modification. [13] Oligomers of well-defined chain-length serve an important role in studying the photo-excitations of conjugated polymers and the subsequent decay of their excited states.…”

Section: Introductionmentioning

confidence: 99%

Observation of the β‐Phase in Two Short‐Chain Oligofluorenes

Tsoi

Charas

Cadby

et al. 2008

Adv Funct Materials

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The polymer poly(9,9‐dioctylfluorene) (PF8) can be driven into a morphological form termed the β‐phase that has enhanced planarity and increased structural rigidity. We show that the β‐phase can be generated in two different fluorene oligomers; a fluorene pentamer, and a short (statistical) oligomer composed of chains having a maximum length of 19 monomer units. By comparing the energy of the zero‐zero phonon line in fluorescence from the β‐phase oligomers with that in the PF8 polymer, we show that the electronic conjugation length of the β‐phase is (30 ± 12) monomer‐units, a value consistent with the persistence length of the molecular chain.

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“…2. In the glassy thin film, the polymer chains are considered to be twisted and bent randomly because its absorption spectrum is almost the same as that of the dilute F8 solution [14,15]. In the β-phase thin film, the entire absorption spectrum is redshifted, and a new absorption band appears at 2.85 eV [10,11].…”

Section: Resultsmentioning

confidence: 99%