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Published on: December 27, 2018
Photophysical characterization of light-emitting poly(indenofluorene)s
Panagiotis E Keivanidis1, Josemon Jacob, Luke Oldridge
1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Summary
New synthesis of poly(2,8-indenofluorene)s improves spectral purity, reducing keto formation. This allows for clearer photophysical studies and understanding of material properties in thin films.
Area of Science:
- Polymer Chemistry
- Materials Science
- Spectroscopy
Background:
- Poly(2,8-indenofluorene)s are advanced organic materials with potential applications in optoelectronics.
- Understanding their photophysical properties is crucial for optimizing device performance.
- Chemical purity and molecular ordering significantly influence these properties.
Purpose of the Study:
- To investigate the photophysical properties of poly(2,8-indenofluorene) derivatives.
- To correlate these properties with material morphology and chemical purity.
- To assess the impact of a novel synthetic approach on spectral purity and keto formation.
Main Methods:
- Time-resolved photoluminescence spectroscopy on solutions and thin films.
- Wide-angle X-ray scattering for molecular ordering analysis.
- Controlled doping experiments with indenofluorene-monoketone.
Main Results:
- A new synthetic method enhances spectral purity and reduces keto byproduct formation.
- Comparison of solution and film properties reveals material purity.
- Molecular ordering in films influences photophysical behavior.
- Doping studies quantify photoluminescence quenching rates and identify a minimum detrimental keto concentration.
Conclusions:
- Complete side-chain substitution before ring formation minimizes keto formation.
- High chemical purity enables observation of intrinsic spectral features.
- Photoluminescence quenching in doped films follows Stern-Volmer kinetics.
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