Electroluminescent Polymer Systems

Akcelrud, Leni

doi:10.1007/978-0-387-69002-5_47

Cited by 5 publications

(1 citation statement)

References 318 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the liquid state, the interchain interactions are usually very weak so that the energy difference between LUMO and HOMO is mainly determined by intrachain interactions (effective conjugation length). In the solid state, the interchain interactions become, however, so strong that the energy difference between the LUMO and HOMO depends not only on intrachain interactions but also on interchain interactions. − …”

Section: Resultsmentioning

confidence: 99%

A Photophysical Interpretation of the Thermochromism of a Polyfluorene Derivative–Europium Complex

et al. 2014

View full text Add to dashboard Cite

The thermochromism of a polyfluorene derivative complexed with a europium ion was interpreted using the photophysical properties of the noncomplexed polymer and a low molecular mass model compound having the same structure of the complexed site in the polymer. To the naked eye, the thermochromism was characterized by a strong red at low temperatures (170− 260 K, due to Eu 3+ ion) and a blue color at higher ones (280−330 K, due to fluorene). Absorption and emission spectra, time-resolved measurements, and theoretical simulations showed that the polymer chain does not affect the europium photophysical properties, but the opposite occurred: the ion insertion precluded interchain aggregation, and the backbone emission did not vary with temperature variation, in the range of 170−330 K. To the best of our knowledge, this effect is reported for the first time and opened a new avenue for the design of nanothermometers, since the polymer can act as a "built-in standard", thus allowing the construction of much simpler devices.

show abstract

Section: Resultsmentioning

confidence: 99%

A Photophysical Interpretation of the Thermochromism of a Polyfluorene Derivative–Europium Complex

et al. 2014

View full text Add to dashboard Cite

show abstract

Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions

Santana

Turchetti

Zanlorenzi

et al. 2021

Macro Chemistry & Physics

Self Cite

View full text Add to dashboard Cite

The magnetic properties of a polyfluorene derivative, {Poly[9,9'-dihexylfluorene-2,7-yl)-3,8-(1,10-phenanthroline)]} and its complexes with neodymium ions are explored and discussed in the light of the macromolecular configuration and photophysical properties. The pristine noncomplexed material is a diamagnetic material, and the introduction of Nd atoms in the polymer leads to a paramagnetic behavior over the entire temperature range. The prominent role of the morphology is demonstrated by comparison of two forms, with different ligands to the metal: one with bulky 𝜷-diketone groups and another with small chorine as ligands. The large groups hinder interchain interaction, whereas the smaller salt forms favored interchain 𝝅-stacking, providing a better interaction of the magnetic field with the polymer backbone, resulting in enhanced magnetic properties. The form with the 𝜷-diketone groups exhibits a paramagnetic behavior whereas the one in the salt form presents ferromagnetic behavior at room temperature. This contribution brings solid confirmation to the importance of interchain interaction in the magnetic properties of conjugated polymers, opening a new way to the obtainment of magnetic conjugated polymers.

show abstract

Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Venkatanarayanan

Krishnan

Sreeram

et al. 2016

Macro Theory & Simulations

View full text Add to dashboard Cite

Thermophysical and mechanical properties of two conjugated polymers, poly(p‐phenylene vinylene) (PPV) and polyacetylene (PA), are predicted using molecular dynamics simulations and compared with results obtained from differential scanning calorimetry, nanoindentation, and dynamic mechanical analysis experiments. Glass transition temperature (Tg) is calculated from the changes in the slopes of the specific volume versus temperature and cohesive energy density versus temperature plots, obtained from constant pressure and constant temperature simulations (NPT ensemble). The effects of temperature on the torsion angle distributions and characteristic ratio are analyzed. PPV is found to have a Tg of 416 ± 8 K. PA does not exhibit a glass transition in the temperature range of 120 to 500 K. Using the static deformation method, the values of Young's modulus are calculated to be 1.81 ± 0.34 GPa for PA and 9.20 ± 0.57 GPa for PPV at 298 K. These values are in good agreement with the experimental measurements, validating the suitability of these techniques in the prediction of the polymer properties.

show abstract

Electroluminescent Polymer Systems

Cited by 5 publications

References 318 publications

A Photophysical Interpretation of the Thermochromism of a Polyfluorene Derivative–Europium Complex

A Photophysical Interpretation of the Thermochromism of a Polyfluorene Derivative–Europium Complex

Magnetic Properties of a Polyfluorene Derivative Metallopolymer Containing Neodymium Ions

Simulated Dilatometry and Static Deformation Prediction of Glass Transition and Mechanical Properties of Polyacetylene and Poly(para‐phenylene vinylene)

Contact Info

Product

Resources

About