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Turning Non-Emissive Schiff Bases Into Aggregate Emitters.
Xinmeng Chen1, Siwei Zhang1, Yefei Jiang2
1Department of Chemistry, and the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China.
Non-emissive Schiff bases can be transformed into luminescent materials through cocrystallization with TCB. This simple method inhibits isomerization and promotes π-π stacking, enabling new applications in organic light-emitting diodes.
Area of Science:
- Materials Science
- Organic Chemistry
- Solid-State Physics
Background:
- Schiff bases are vital functional materials but often lack luminescence.
- Existing methods to induce luminescence in Schiff bases are complex and resource-intensive.
Purpose of the Study:
- To develop a facile strategy for converting non-emissive Schiff bases into luminescent materials.
- To explore the mechanism of cocrystallization-induced emission (CIE) in Schiff base systems.
Main Methods:
- Cocrystallization of Schiff bases with 1,2,4,5-tetracyanobenzene (TCB) via simple grinding.
- Experimental characterization (e.g., spectroscopy, X-ray diffraction) and theoretical calculations (e.g., DFT).
Main Results:
- Non-emissive Schiff bases were successfully converted into green-yellow to yellow aggregate emitters.
- Cocrystallization was found to inhibit C=N isomerization and promote π-π interactions, leading to induced emission.
- The CIE strategy enabled observation of solid-state molecular diffusion and application in solution-processed organic light-emitting diodes (OLEDs).
Conclusions:
- Cocrystallization offers a straightforward and efficient route to develop luminescent Schiff base materials.
- This approach provides new C=N structural motifs for aggregation-induced emission (AIE) and related systems.
- The study demonstrates the potential of CIE for advancing OLED technology and observing solid-state phenomena.
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