Optical spectroscopy of oriented films of poly(2,5-pyridinediyl)

Feller, F.; Monkman, Andrew P.

doi:10.1103/physrevb.61.13560

Cited by 10 publications

(11 citation statements)

References 12 publications

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“…The two PA spectra have a slightly different shape and the parallel PA profile has also a slightly redshifted maximum relative to the perpendicular case. This has also been observed in stretch oriented PPY films 10 and is ascribed to a larger delocalization length in the ordered chains. The PL spectra depend strongly on the polarization of the excitation and the emitted light, leading to a five-fold difference in intensity between the parallel and perpendicular case.…”

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confidence: 54%

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Polarized luminescence from self-assembled, aligned, and cleaved supramolecules of highly ordered rodlike polymers

Knaapila

Ikkala

Torkkeli

et al. 2002

Applied Physics Letters

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Deposited in DRO:PW tnury PHIS Version of attached le: ulished ersion Peer-review status of attached le: eerEreviewed Citation for published item: unpilD wF nd skklD yF nd orkkeliD wF nd tokelD uF nd erimD F nd holnyD sFF nd frsD F nd ten frinkeD qF nd rorsurghD vFiF nd ¦ lssonD vFEyF nd wonkmnD eFF @PHHPA 9olrized luminesene from selfEssemledD lignedD nd leved suprmoleules of highly ordered rodlike polymersF9D epplied physis lettersFD VI @VAF ppF IRVWEIRWIF Further information on publisher's website: httpsXGGdoiForgGIHFIHTQGIFIRWWPPP Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. A hierarchical self-assembly in comb-shaped supramolecules of conjugated rodlike polymers is reported. The supramolecules consist of poly͑2,5-pyridinediyl͒, acid dopants, and hydrogen bonded alkyl side chains. A thermotropic smectic state with an exceptionally large coherence length is formed without additional solvent. This allows facile overall alignment resulting in high dichroism and polarized photoluminescence. Solid films are formed by cleaving side groups from the supramolecules which retain the optical anisotropy together with the high photoluminescence quantum yield of pristine polymer.

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confidence: 54%

“…To prevent macrophase separation only selected x,y values are allowed. Complexes were studied using x-ray diffraction 7,9 and photophysical 8,10 techniques. The starting materials are crystalline.…”

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confidence: 99%

Polarized luminescence from self-assembled, aligned, and cleaved supramolecules of highly ordered rodlike polymers

Knaapila

Ikkala

Torkkeli

et al. 2002

Applied Physics Letters

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“…Because of similar shape of PL spectra, the origin of PL is suggested to be same both in the case (a) and (b). Slight redshift of PA curve (c) relative to (d) have also been observed in a stretch oriented PPY [12]. The difference in sensitivity of spectrometer was calibrated using dilute Coumarin 314 solution in methanol.…”

Section: Cleavage Of the Side Chainsmentioning

confidence: 77%

“…Optical absorption spectra were measured using a Perkin Elmer Lambda 19 spectrophotometer [4,12]. PL measurements were performed using a charge coupled device (CCD) spectrophotometer (Jobin Yvon Fluoromax) following excitation at the peak of absorption by monochromatized light from a HgXe lamp.…”

Section: Methodsmentioning

confidence: 99%

Self-assembled, aligned, and cleaved supramolecules of poly(2,5-pyridinediyl)

Knaapila¹,

Torkkeli

Pålsson

et al. 2002

MRS Proc.

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We report on directed self-assembly in supramolecules containing rod-like polymers. The comb-shaped supramolecules consist of poly(2,5-pyridinediyl), camphorsulfonic acid, and hydrogen bonded amphiphilic side chains. Locally they form highly ordered lamellar structures in which the polymers are stacked. The liquid crystalline state allows facile overall alignment yielding absorption dichroism and polarized photoluminescence. After alignment, cleavage of the amphiphiles results in solid films which retain this optical anisotropy with the high photoluminescence quantum yield. CONCLUSIONSConjugated rod-like polymer, PPY, forms comb shaped supramolecules which assemble in highly ordered smectic local structures and can be aligned to form directed assembly. High absorption dichroism and polarized PL are observed. Hydrogen bonded amphiphiles can be cleaved after alignment, which retains optical anisotropy and improve PLQY.

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“…The use of photoconductivity to determine the nature of optical charge generation and transport in conjugated polymers is an active area of research [6][7][8][9][10]. It is accepted that the absorption of photons in conjugated polymer produces excitons.…”

Section: Introductionmentioning

confidence: 99%

Steady State Photoconductivity in Conjugated Polymers

2001

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Visible and ultraviolet photoconductivity (PC) measurements have been performed on thick (7µm) and thin (170nm) films of poly[2-methoxy, 5 ethyl (2' hexyloxy) paraphenylenevinylene] (MEH-PPV) sandwiched between indium tin oxide (ITO) and semitransparent gold (Au) electrodes. PC spectra were obtained for samples under different bias polarities and for illumination through the ITO electrode and through the Au electrode. The results obtained indicate that the absorbed photons form excitons that dissociate extrinsically at or near the electrodes to form hole polarons or intrinsically at higher photon energies in the bulk polymer.

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Optical spectroscopy of oriented films of poly(2,5-pyridinediyl)

Cited by 10 publications

References 12 publications

Polarized luminescence from self-assembled, aligned, and cleaved supramolecules of highly ordered rodlike polymers

Polarized luminescence from self-assembled, aligned, and cleaved supramolecules of highly ordered rodlike polymers

Self-assembled, aligned, and cleaved supramolecules of poly(2,5-pyridinediyl)

Steady State Photoconductivity in Conjugated Polymers

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