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Published on: December 27, 2018
Spatial isomerism regulates host-guest distance for highly efficient organic room-temperature phosphorescence
Hao Sun1, Chen Lu1, Jianye Gong1
1College of Chemistry and Chemical Engineering, Institute of Green Chemistry and Environment, Institutes of Biomedical Sciences, Inner Mongolia Key Laboratory of Synthesis and Application of Organic Functional Molecules, Inner Mongolia University Hohhot 010021 P. R. China wangjg@iccas.ac.cn jiangguoyu@mail.ipc.ac.cn.
Researchers developed a spatial isomerism strategy to control molecular distances in organic room-temperature phosphorescent (RTP) materials. This method significantly boosts phosphorescence performance and enables tunable color for advanced anti-counterfeiting and encryption applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Photophysics
Background:
- Organic room-temperature phosphorescent (RTP) materials utilize Dexter triplet-triplet energy transfer (TTET) for applications like anti-counterfeiting and sensing.
- Current research primarily focuses on host-guest energy-level alignment, with limited strategies for molecular-level distance manipulation.
Purpose of the Study:
- To explore a spatial isomerism strategy for precisely modulating host-guest distances in RTP materials.
- To enhance phosphorescence quantum yield and lifetime through improved TTET.
- To investigate the acid-base stimulus-responsiveness for tunable phosphorescent color.
Main Methods:
- Employing a spatial isomerism strategy to control host-guest distances.
- Synthesizing and characterizing doped RTP systems.
- Utilizing quantum mechanics/molecular mechanics (QM/MM) calculations to analyze host-guest interactions and distances.
- Investigating acid-base stimulus-responsiveness for color tuning.
Main Results:
- Achieved a significant increase in phosphorescence quantum yield (0.81% to 8.97%) and extended lifetime (23 to 158 ms) via enhanced TTET.
- Demonstrated that guest crystal structure and electronic properties influence phosphorescence quantum yield.
- Quantitatively showed host-guest distance compression from 3.36 Å to 2.86 Å, enhancing TTET.
- Observed reversible control of phosphorescent color in response to acid-base stimuli.
Conclusions:
- Spatial isomerism is an effective strategy for optimizing host-guest distances and enhancing RTP performance.
- The developed materials exhibit tunable phosphorescence, enabling multi-level environmental responsiveness.
- These findings offer possibilities for advanced anti-counterfeiting and information encryption platforms.
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