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Self-assembled zinc(II) Schiff base polymers for applications in polymer light-emitting devices
Chi-Chung Kwok1, Sze-Chit Yu, Iona H T Sham
1Department of Chemistry and the HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, SAR, China.
Chemical Communications (Cambridge, England)
|November 30, 2004
Summary
New zinc(II) Schiff base polymers offer high thermal stability and tunable photoluminescence (PL) and electroluminescence (EL) for polymer light-emitting diodes (PLEDs). These materials show promise for efficient electronic display applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Organic Electronics
Background:
- Schiff base polymers are known for their versatile coordination chemistry and potential applications in optoelectronics.
- Tuning the electronic and optical properties of polymers is crucial for developing advanced organic electronic devices.
Purpose of the Study:
- To synthesize and characterize novel thermally stable zinc(II) Schiff base polymers.
- To investigate the photoluminescence (PL) and electroluminescence (EL) properties of these polymers.
- To evaluate their performance as emitters in polymer light-emitting diodes (PLEDs).
Main Methods:
- Self-assembly reactions of zinc(II) salts and salicylaldimine monomers were employed for polymer synthesis.
- Thermogravimetric analysis (TGA) was used to determine thermal stability.
- Photoluminescence (PL) and electroluminescence (EL) spectra were measured.
- Fabrication and testing of PLED devices utilizing the synthesized polymers as emissive layers.
Main Results:
- Thermally stable zinc(II) Schiff base polymers with decomposition temperatures up to 461°C and number-average molecular weights (M(n)) ranging from 13580 to 20440 were successfully synthesized.
- The polymers exhibited tunable blue to yellow photoluminescence (PL) with quantum yields up to 0.34 in N,N-dimethylformamide (DMF).
- Polymer light-emitting diodes (PLEDs) fabricated with these polymers as emitters demonstrated green or orange electroluminescence (EL) with low turn-on voltages (5 and 6 V) and maximum efficiencies of 2.0 and 2.6 cd A⁻¹.
Conclusions:
- The synthesized zinc(II) Schiff base polymers possess excellent thermal stability and tunable optoelectronic properties.
- These polymers are promising candidates for efficient emissive materials in polymer light-emitting diodes (PLEDs).
- The study highlights the potential of self-assembly strategies for creating functional polymers for organic electronics.