Electro-reflectance spectra of one-dimensional excitons in polydiacetylene crystals

Tokura, Y.; Oowaki, Y.; Koda, T.; Baughman, Ray H.

doi:10.1016/0301-0104(84)87009-3

Cited by 73 publications

(15 citation statements)

References 14 publications

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“…Kramers-Kronig transformation yields, with an accuracy better than 5 meV, the exciton transition energy, 2.171 eV and the free carrier gap, 2.727 eV, indicating an exciton binding energy E b ~ 556 meV (see table 1). This is about 10% larger than that obtained in bulk blue PDA crystals with exciton below 2 eV, but similar to that of red bulk crystals like TCDU [21]. The derivative lineshape of the ER spectrum is compatible with coupling of the exciton by the electric field F to its continuum of ionized states with the mean square displacement r of electron and hole representing the transition dipole [15]:…”

Section: Reflectance and Electroreflectancesupporting

confidence: 55%

Exciton spectroscopy of red polydiacetylene chains in single crystals

Barisien

Legrand

Weiser

et al. 2007

Chemical Physics Letters

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The absorption and emission properties of excitons are investigated in a pure "red" phase of luminescent polydiacetylene wires. The values of the binding energy (E b = 0.556 eV) and Bohr radius (r ~ 14 Å) make the "red" exciton similar to the one of the extensively studied "blue" phase, so the conformational modifications which lead to a reordering of excited states and luminescent emission do not strongly affect the exciton structure. The opening of a thermally activated non radiative channel leads to an efficient quenching of the intense luminescence observed at low temperature.

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Section: Reflectance and Electroreflectancesupporting

confidence: 55%

Exciton spectroscopy of red polydiacetylene chains in single crystals

Barisien

Legrand

Weiser

et al. 2007

Chemical Physics Letters

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“…Similarly, we do not discuss electroabsorption studies in PDAs that claim a two-photon state at 2.4 eV. 22 The latter interpretation of electroabsorption data would put the rnAg state at the lower threshold of the conduction band (while being way below 1.5 E9) and thus be in agreement with the theory presented here. It is thus tempting for us to agree to this interpretation.…”

Section: Comparison To Experimentssupporting

confidence: 71%

<title>Microscopic mechanism of optical nonlinearity in conjugated polymers and other quasi-one-dimensional systems</title>

Mazumdar

Guo

Dixit

1991

Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films

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We present a microscopic mechanism of optical nonlinearity in quasi-one-dimensional semiconductors within the context of rigid band Peierls-extended Hubbard models. A detailed configuration space analysis is done to predict the dominant excitation paths. We show that only two channels contribute to the bulk of the optical nonlinearity, even though an infinite number of channels are possible in prinicple. Most importantly, these channels involve a virtual two photon excited state whose relative energy should be nearly parameter independent in the infinite chain limit. This would imply that the mechanism of optical nonlinearity, as well as the frequency dependence of the third order optical susceptibility, are also largely parameter independent. This universality is a consequence of the one dimensionality alone and remains valid for arbitrary convex Coulomb interactions. These conjectures are confirmed by exact numerical calculations on finite chains that do very careful analysis of finite size effects.

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“…The situation for 4PU is more complex. [30,34,35] A phase transition occurs at low temperature and under high pressure and the original form is recovered by heating to ca. 62 8C.…”

Section: Introductionmentioning

confidence: 99%

Dissolution and Spectroscopic Properties of the Polydiacetylene Poly(10,12-docosadiyne-1,12-diol-bisethylurethane)

Bloor¹

2001

Macromol. Chem. Phys.

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Electro-reflectance spectra of one-dimensional excitons in polydiacetylene crystals

Cited by 73 publications

References 14 publications

Exciton spectroscopy of red polydiacetylene chains in single crystals

Exciton spectroscopy of red polydiacetylene chains in single crystals

<title>Microscopic mechanism of optical nonlinearity in conjugated polymers and other quasi-one-dimensional systems</title>

Dissolution and Spectroscopic Properties of the Polydiacetylene Poly(10,12-docosadiyne-1,12-diol-bisethylurethane)

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