Logical switching with the use of bipolarons in conjugated polymers

Pinheiro, Cleber da Silva; Acioli, Paulo H.; Silva, Geraldo Magela e

doi:10.1016/s0166-1280(00)00772-7

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…Our previous research has also shown that polarons with the same charge and antiparallel spins can scatter into bipolaron states, and the bipolarons can collect in the region where the chains interact and at the interface in polymer/polymer heterojunction materials . The conversion of polarons to bipolarons and the propagation of a moving charged bipolaron have also been studied numerically on a single conjugated polymeric chain. The above cited works, therefore, show that the bipolaron, like the polaron, is a common type of self-localized excitation that plays an important role in conjugated polymers, and the participation of bipolarons can open more electroluminescence channels. , …”

Section: Introductionmentioning

confidence: 99%

Electroluminescence Enhancement in Polymer Light-Emitting Diodes through Inelastic Scattering of Oppositely Charged Bipolarons

Meng

Wang

et al. 2011

J. Phys. Chem. B

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Combining the one-dimensional tight-binding Su-Schrieffer-Heeger (SSH) model and the extended Hubbard model (EHM), the scattering and combination of oppositely charged bipolarons in conjugated polymers are investigated using a nonadiabatic evolution method. On the basis of this physical picture, bipolarons can scatter into a singlet biexcitonic state, in which two electrons and two holes are trapped together by a lattice distortion. This biexcitonic state can emit one photon to an exciton state, which can subsequently decay to the ground state. The results indicate that the scattering and combination of oppositely charged bipolarons may provide guidance for improving the internal quantum efficiency for electroluminescence to as high as 75% in polymer light-emitting diodes.

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Section: Introductionmentioning

confidence: 99%

Electroluminescence Enhancement in Polymer Light-Emitting Diodes through Inelastic Scattering of Oppositely Charged Bipolarons

Meng

Wang

et al. 2011

J. Phys. Chem. B

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“…Recent works have showed that conducting polymers have special properties that are interesting of the point of view of this new technology [1][2][3][4][5]. Conjugated polymers are good materials to be employed in the fabrication of molecular electronic devices because they have properties that can be controlled by external parameters.…”

Section: Introductionmentioning

confidence: 99%

Polaron dynamics with impurities in conjugated polymers

Lima

Silva

2005

Braz. J. Phys.

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We study the charge transport by polarons in conjugated polymers in the presence of impurities. The effects on the polaron motion due to the symmetry of the chain is considered. The polaron dynamics in doped conjugated polymers is numerically studied using the Su-Schrieffer-Heeger (SSH) model combined with the Pariser-Parr-Pople (PPP) model modifi ed to include an external electric fi eld and the Brazovskii-Kirova (BK) symmetry breaking interaction. The time dependent Hartree-Fock approximation is used. The electric fi eld is used to accelerate the polaron in a polymer chain. Polaron trapped by the impurity and polaron-impurity collisions are considered. When the polaron-structure is around the impurity site a charge oscillation can be observed. Nevertheless, when there are collisions between the polaron and the impurity, the polaron-structure can pass, be trapped or be reflected. These effects are determined by the strength of the radical parameter and by the electric fi eld intensity. The effects on the polaron are analyzed and an effective potential is determined. Therefore, the effective potential determines the polaron behavior for each case, as the polaron pass, or it is trapped or reflected by an impurity.

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Polaron stability under collision with different defects in conjugated polymers

Lima¹,

Silva²

2006

Int J of Quantum Chemistry

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ABSTRACT:Polarons are charge carriers generated by doping or photo-excitation in conjugated polymers. The dynamics of polaron-soliton and polaron-bipolaron collisions in conjugated polymers is numerically studied using the Su-Schrieffer-Heeger model extended to include an external electric field, Coulomb interactions, and impurities interactions. The time-dependent unrestricted Hartree-Fock approximation is considered. The stability of polarons determines whether the charge transport by these structural defects are modified under these collisions. An energetic analysis determines whether the energy levels associated with solitons, polarons, and bipolarons change with collisions. We show that these structural defects have great stability in collisions. The bipolaron mobility does not change under polaron-bipolaron collisions. In contrast, we find that there is a great exchange of linear momentum in the collisions between solitons and polarons.

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Logical switching with the use of bipolarons in conjugated polymers

Cited by 5 publications

References 16 publications

Electroluminescence Enhancement in Polymer Light-Emitting Diodes through Inelastic Scattering of Oppositely Charged Bipolarons

Electroluminescence Enhancement in Polymer Light-Emitting Diodes through Inelastic Scattering of Oppositely Charged Bipolarons

Polaron dynamics with impurities in conjugated polymers

Polaron stability under collision with different defects in conjugated polymers

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