Intrinsically stretchable fully π-conjugated polymers with inter-aggregate capillary interaction for deep-blue
Mingjian Ni1,2, Zhiqiang Zhuo1, Bin Liu3
1Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, China.
Nature Communications
|January 3, 2025
Summary
Researchers developed an asymmetric substitution strategy to enhance the flexibility and printability of conjugated polymers for optoelectronic devices. This method improves inkjet-printed film stretchability and reduces the coffee-ring effect for uniform deposition.
Area of Science:
- Materials Science
- Polymer Chemistry
- Optoelectronics
Background:
- Fully π-conjugated polymers offer excellent optoelectronic properties for flexible devices.
- Challenges include poor printability and brittleness due to the coffee-ring effect and rigid structures.
Purpose of the Study:
- To improve the printable and stretchable properties of deep-blue light-emitting conjugated polymers.
- To enable high-performance flexible printed polymer light-emitting diodes (PLEDs).
Main Methods:
- An asymmetric substitution strategy was employed on conjugated polymers.
- The strategy focused on creating loose, rod-shaped polymer chain stacking in precursor ink.
- Investigated the role of anisotropic aggregates and capillary interactions.
Main Results:
- The asymmetric structure enhanced the intrinsic stretchability of inkjet-printed films.
- Rod-like polymer aggregates induced strong capillary interactions, suppressing the coffee-ring effect.
- Achieved uniform deposition and formation of uniform printed films.
Conclusions:
- Asymmetric substitution is an effective strategy for improving the processability of conjugated polymers.
- The developed polymers are suitable for fabricating high-performance, flexible printed PLEDs.
- This approach addresses key challenges in flexible electronics manufacturing.
