Chemical tuning of electroluminescent copolymers to improve emission efficiencies and allow patterning

Burn, Paul L.; Holmes, Andrew B.; Kraft, Arno; Bradley, Donal D. C.; Brown, Adam R.; Friend, Richard H.; Gymer, R. W.

doi:10.1038/356047a0

Cited by 754 publications

(253 citation statements)

References 15 publications

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“…1 Introducing meta-phenylene rings into the polymer chain is one way to restrict conjugation. [2][3][4] Studies of PPV derivatives with alternate meta-and paraphenylene rings, have shown that the absorption and emission spectra are blueshifted relative to PPV. [5][6][7] This should restrict exciton diffusion to quenching sites and lead to increased PL quantum efficiency.…”

Section: Introductionmentioning

confidence: 99%

Photophysics of a poly(phenylenevinylene) with alternatingmeta-phenylene andpara-phenylene rings

et al. 2000

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We have investigated the photophysics of the luminescent polymer poly͑1,3-phenylenevinylene-alt-2,5-dioctyloxy-1,4-phenylenevinylene͒ by a variety of optical spectroscopies. The incorporation of alternating meta-phenylene and para-phenylene rings restricts conjugation with respect to poly͑para-phenylenevinylene͒ derivatives. As a consequence, excited states are blueshifted and the nonlinear susceptibility is reduced. Absorption by aggregates, which can be obscured by scattering and interference, is clearly revealed by electroabsorption spectroscopy. The reduced symmetry of 1,3-PPV modifies optical selection rules, resulting in strong overlap of the fluorescence spectrum with excited state absorption by charged polarons.

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Section: Introductionmentioning

confidence: 99%

Photophysics of a poly(phenylenevinylene) with alternatingmeta-phenylene andpara-phenylene rings

et al. 2000

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“…5,6 An alternative is to take a physical approach and blend materials. For evaporated small molecular OLEDs it has been shown that a blend layer can lead to improved reliability and efficiency.…”

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Tuning of emission color for blue dendrimer blend light-emitting diodes

Markham

Namdas

Anthopoulos

et al. 2004

Applied Physics Letters

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“…Moreover, the dimethoxy substitution in PPV molecule increases the difference between the electric field thresholds needed to move positive and negative single carriers along the polymer molecule relative to PPV [12,14]. Since the above results can affect bipolar charge transport in light-emitting diodes which use a copolymer of PPV and DMeOPPV as active layer [15], one should consider the effect of intra-molecular charge transport for the interpretation and understanding of the observed device characteristics.…”

Section: Dynamic Propertiesmentioning

confidence: 99%

Intra-molecular properties of DMeOPPV studied by quantum molecular dynamics

Correia

Ramos

2005

Computational Materials Science

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Introducing methoxy electron donor groups into a poly(para-phenylene vinylene) (PPV) chain will lead to the appearance of unique electronic properties at the molecular scale which should affect the overall properties of light-emitting diodes based on these polymers.Self-consistent quantum molecular dynamics calculations have been used to provide information on intra-molecular properties of poly(2,5-dimethoxy-para-phenylene vinylene) (DMeOPPV), which are relevant for the modelling and characterization of polymer lightemitting diodes at nanometric length scale. We focus our attention in those properties that have been somewhat neglected in previous literature: the charge distribution associated with positive and negative charge carriers and their intra-molecular mobility when an electric field is applied.

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Chemical tuning of electroluminescent copolymers to improve emission efficiencies and allow patterning

Cited by 754 publications

References 15 publications

Photophysics of a poly(phenylenevinylene) with alternatingmeta-phenylene andpara-phenylene rings

Photophysics of a poly(phenylenevinylene) with alternatingmeta-phenylene andpara-phenylene rings

Tuning of emission color for blue dendrimer blend light-emitting diodes

Intra-molecular properties of DMeOPPV studied by quantum molecular dynamics

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