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Published on: February 27, 2019
Tunable Circularly Polarized Afterglow from Cholesteric Liquid Crystalline Polymer Networks
Peipei Guan1, Fengyun Shi1, Chenqingliang Xu1
1Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and Devices, State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
Researchers developed organic circularly polarized afterglow (CPA) materials with tunable properties. These novel CPA films exhibit enhanced luminescence dissymmetry and ultralong lifetimes, showing promise for advanced applications.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Circularly polarized afterglow (CPA) materials are crucial for advanced applications.
- Developing organic CPA materials with high luminescence dissymmetry factors (g_lum) and long lifetimes is challenging.
Purpose of the Study:
- To fabricate organic CPA materials with tunable properties, large g_lum, and ultralong lifetimes.
- To explore CPA materials for applications in image encryption and anticounterfeiting.
Main Methods:
- Photopolymerization of liquid crystalline mixtures doped with binaphthyl derivatives to create CPA polymer films.
- Incorporation of rhodamine 6G (Rh6G) via photopolymerization to tune CPA properties through phosphorescence energy transfer.
Main Results:
- Fabricated polymer films exhibit structural colors, room-temperature phosphorescence (RTP), and circularly polarized RTP.
- Achieved phosphorescence dissymmetry factors up to 0.70 and tunable lifetimes up to 730 ms.
- Enhanced g_lum values and quantum yields up to 8.6% were obtained using Rh6G via phosphorescence energy transfer.
Conclusions:
- A facile strategy for preparing CPA films with large g_lum, tunable lifetimes, and colors was developed.
- The developed CPA films show potential for image encryption and anticounterfeiting technologies.
