Exciton spectroscopy of red polydiacetylene chains in single crystals

Barisien, Thierry; Legrand, Laurent; Weiser, G.; Deschamps, Jéromes; Balog, Mirela; Boury, Bruno; Dutremez, Sylvain G.; Schott, M.

doi:10.1016/j.cplett.2007.07.031

Cited by 24 publications

(44 citation statements)

References 23 publications

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“…20 The red shift of the absorption maximum with increasing N is also in fair agreement with experiment. 20 The red shift of the absorption maximum with increasing N is also in fair agreement with experiment.…”

Section: Applications To Pdasupporting

confidence: 78%

“…2,16,18,20 Such chains are highly emissive, with a PL spectrum characterized by extremely narrow lines only tens of wave numbers wide, indicating a strong degree of order. 2,16,18,20 Such chains are highly emissive, with a PL spectrum characterized by extremely narrow lines only tens of wave numbers wide, indicating a strong degree of order.…”

Section: Applications To Pdamentioning

confidence: 99%

“…18 (Here, we associate the 0-1 sideband with the vinyl stretching mode labeled "D" in Ref. 16,20 The difference allows the 1 1 B u state to have lower energy than the 2A g state in the red form, thereby allowing emission. The 0-1 sideband associated with the acetyl stretch labeled "T" is very similar in strength to the D-band.)…”

Section: Applications To Pdamentioning

confidence: 99%

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Vibronic coupling in quantum wires: Applications to polydiacetylene

Yamagata

Spano

2011

The Journal of Chemical Physics

115

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A theory describing vibronic coupling in direct band gap, one-dimensional semiconductors is developed to account for the photophysical properties of isolated, defect-free conjugated polymers. A Holstein-like Hamiltonian represented in a multi-particle basis set is used to evaluate absorption and emission due to Wannier-Mott excitons. The photophysical properties of such quantum wires are shown to strongly resemble those of Frenkel exciton J-aggregates. The 1(1)B(u) exciton coherence length and effective mass are readily determined from the ratio of the 0-0 and 0-1 line strengths, I(0 - 0)/I(0 - 1), in the photoluminescence spectrum. I(0 - 0)/I(0 - 1) is shown to follow a T(-1/2) dependence, in an excellent agreement with experiments on the red-phase of polydiacteylene.

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Section: Applications To Pdasupporting

confidence: 78%

Section: Applications To Pdamentioning

confidence: 99%

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Vibronic coupling in quantum wires: Applications to polydiacetylene

Yamagata

Spano

2011

The Journal of Chemical Physics

115

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“…18,19 The large thermal reactivity of this monomer prevented studies of highly diluted chains but electrore ‡ectance spectra of opaque crystals resolved the exciton at 2.171 eV and the band gap at 2.727 eV. 19 Although the exciton transition energy is larger than that of blue chains the binding energy 0.56 eV is similar and lends no support to a signi…cant change of the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2

et al. 2010

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Conjugated polymer chains diluted in monomer single crystals of a novel diacetylene, 1,10-bis(diphenylamino)-4,6-decadiyne, represent quantum wires of long range coherence. They di¤er from most polydiacetylenes by their repeat unit that consists of two C 4 units with twisted molecular planes. The resulting modi…cation of exciton and band states is studied by electroabsorption which resolves an increase of the exciton transition energy to 2.399 eV and of the free electron gap to 3.158 eV. The Stark shift of the exciton reveals a signi…cant reduction of the exciton radius by about 40 % to 6 1 Å which is consistent with a similar increase of the exciton binding energy to 759 meV. The lineshape of electroabsorption spectra at the free electron gap is for …elds larger than 30 kV/cm in accordance with the one-dimensional Franz-Keldysh e¤ect and yields a reduced mass of 0.07 m 0 larger than in other PDA. Spectra at smaller …elds are distorted by contributions of a weak dipole allowed and a forbidden exciton 38 and 12 meV, respectively below the bandgap.Coherent coupling of free electrons and vibrational modes leads to replicas of the Franz-Keldysh e¤ect. Since light polarized parallel to the conjugated chain excites two propagating modes in the monomer crystals the quantitative analysis was restricted to EA spectra taken with perpendicular polarization in samples which transmit only the weakly absorbed polariton mode.

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“…At this temperature, the fluorescence quantum yield is around 0.35. The Bohr radius (~15 Å) and binding energy (~0.6 eV) of such a red exciton have been determined in two new luminescent polydiacetylenes [4,5].…”

mentioning

confidence: 99%

Excitons in a perfect quasi‐1D organic quantum wire, an isolated polydiacetylene chain

Legrand

Choueiry

Holcman

et al. 2008

Physica Status Solidi (b)

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Symposium on Modern Developmnets in Multiphysics Materials Simulations, Berlin, GERMANY, 2008International audienceThe exciton in single luminescent polydiacetylene (PDA) chains dispersed in their single crystal monomer matrix is studied. As reported these quantum wires have the properties of a perfect quasi-1D semiconducting system. The macroscopic spatial coherence of a single exciton state on a chain as a function of temperature is investigated using an interference experiment. The interference pattern contrast decreasing with increasing temperature is non zero up to 30 K. Experiments developed in order to observe the regime of formation of the stationary coherent exciton state are described. Within the time resolution of the experiment, it is concluded that the formation of this state is faster than similar to 5 picoseconds which confirms the assumption of a transient regime. Finally the first steps of the manipulation of phase locked excitonic wave-packets on a PDA wire are discussed. The experimental results measured in a weak exciton-photon coupling regime are compared to simulations obtained through the Bloch optical equations in the framework of a three-levels model. A direct estimate of the coherence time of the vibronic state photocreated in the present non resonant scheme is derived. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA. Weinhei

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Exciton spectroscopy of red polydiacetylene chains in single crystals

Cited by 24 publications

References 23 publications

Vibronic coupling in quantum wires: Applications to polydiacetylene

Vibronic coupling in quantum wires: Applications to polydiacetylene

Stark effect and Franz-Keldysh effect of a quantum wire realized by conjugated polymer chains of a diacetylene 3NPh2

Excitons in a perfect quasi‐1D organic quantum wire, an isolated polydiacetylene chain

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