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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Dynamic Ultra-long Room Temperature Phosphorescence Enabled by Amorphous Molecular "Triplet Exciton Pump" for
Huangjun Deng1, Gaoyu Li1, Haozhi Xie1
1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, GBRCE for Functional Molecular Engineering, School of Chemistry, Sun Yat-sen University, 510275, Guangzhou, P. R. China.
Researchers developed a new amorphous material (DPOBP-Br) that acts as a universal host for organic ultra-long room-temperature phosphorescence (RTP). This innovation enables dynamic, multi-dimensional anti-counterfeiting applications with advanced tempo-spatial resolution.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Organic ultra-long room-temperature phosphorescence (RTP) materials in amorphous states are crucial for applications like sensors, bioimaging, and encryption.
- Developing amorphous molecular hosts for host-guest RTP systems remains a significant challenge.
Purpose of the Study:
- To design and synthesize a universal amorphous molecular host for organic RTP systems.
- To create novel amorphous host-guest systems exhibiting tunable ultra-long RTP.
- To demonstrate advanced anti-counterfeiting applications using dynamic RTP.
Main Methods:
- Designed DPOBP-Br by integrating diphenylphosphine oxide (DPO) and 4-bromo-benzophenone (BP-Br) moieties.
- Doped various commercial fluorescence dyes into DPOBP-Br films to form amorphous host-guest systems.
- Investigated energy transfer processes and external heavy-atom effects for triplet exciton generation.
- Achieved dynamic RTP by controlling oxygen concentration via UV irradiation.
Main Results:
- Successfully synthesized DPOBP-Br as a universal amorphous molecular host.
- Created amorphous host-guest systems with ultra-long RTP emission spanning green to red colors.
- Demonstrated that DPOBP-Br functions as a 'triplet exciton pump' via energy transfer and heavy-atom effects.
- Achieved dynamic RTP and realized multi-dimensional anti-counterfeiting coatings on curved surfaces with tempo-spatial dependence.
Conclusions:
- DPOBP-Br serves as an effective universal amorphous molecular host for RTP systems.
- The developed strategy enables the design of new amorphous hosts for advanced RTP applications.
- The dynamic ultra-long RTP of amorphous systems offers a promising platform for sophisticated information encryption with tempo-spatial resolution.
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