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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
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Optical gain from polyfluorene keto defects in a liquid crystal mixture.
S Bolis1, M Celebrano, L Ghirardini
1OPERA-photonics, Université libre de Bruxelles (U.L.B.), CP 194/5, 50 Avenue F.D. Roosevelt, 1050 Bruxelles, Belgium.
Chemical Communications (Cambridge, England)
|May 16, 2015
Summary
We observed optical properties during phase separation in polyfluorene and liquid crystal mixtures. Keto defects at domain boundaries create a large polarized gain region, crucial for understanding material interactions.
Area of Science:
- Materials Science
- Optoelectronics
- Polymer Science
Background:
- Phase separation in polymer-liquid crystal mixtures is critical for device performance.
- Understanding optical properties at domain interfaces is essential for advanced materials.
Purpose of the Study:
- To investigate the optical properties of phase separation in polyfluorene and liquid crystal (LC) mixtures.
- To characterize the role of keto defects in polarized gain phenomena.
Main Methods:
- Confocal photoluminescence measurements.
- Femtosecond (fs) pump-probe spectroscopy.
Main Results:
- Observed distinct optical properties associated with phase separation.
- Identified a large polarized gain region at the boundaries of LC-rich micro-domains.
- Linked this gain to keto defects arising from the single-chain nature of the defect.
Conclusions:
- Phase separation significantly influences optical properties in these mixtures.
- Keto defects are key contributors to polarized gain at domain interfaces.
- Findings provide insights into defect-mediated optical phenomena in functional materials.
