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Intense Organic Afterglow Enabled by Molecular Engineering in Dopant-Matrix Systems
Xun Li1, Guangming Wang1, Jiuyang Li1
1Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People's Republic of China.
ACS Applied Materials & Interfaces
|December 29, 2021
Summary
We developed novel afterglow materials using luminescent difluoroboron β-diketonate (BF2bdk) dopants in benzoic acid (BA) matrices. These materials exhibit efficient and long-lasting room-temperature afterglow, surpassing previous limitations.
Area of Science:
- Materials Science
- Photochemistry
- Organic Chemistry
Background:
- Developing materials with efficient and long-lasting afterglow at room temperature is crucial for advanced optical applications.
- Existing afterglow materials often suffer from low efficiency or short lifetimes, especially at ambient temperatures.
Purpose of the Study:
- To design and synthesize novel dopant-matrix afterglow systems with enhanced performance.
- To investigate the mechanisms responsible for achieving efficient and long-lasting room-temperature afterglow.
Main Methods:
- Synthesis of luminescent difluoroboron β-diketonate (BF2bdk) dopants and their deuterated analogs.
- Doping BF2bdk into benzoic acid (BA) matrices.
- Characterization of photophysical properties, including afterglow efficiency (ΦAG) and lifetime (τAG).
Main Results:
- Achieved high afterglow efficiency (ΦAG = 47%) and long afterglow lifetime (τAG = 1.3 s) at room temperature.
- Demonstrated that hydrogen bonding and deuteration significantly reduce non-radiative decay rates (knr + kq).
- Observed triplet-triplet annihilation at high doping concentrations, further boosting afterglow efficiency.
Conclusions:
- BF2bdk-BA systems represent a breakthrough in room-temperature afterglow materials.
- The combination of molecular design, matrix effects, and deuteration is key to achieving superior afterglow properties.
- These findings open new avenues for developing high-performance phosphorescent materials.
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