Intrinsically stretchable fully π-conjugated polymer film via fluid conjugated molecular external-plasticizing for flexible light-emitting diodes

Zhiqiang Zhuo, Mingjian Ni, Ningning Yu, Yingying Zheng, Yingru Lin, Jing Yang, Lili Sun, Lizhi Wang, Lubing Bai, Wenyu Chen, Man Xu, Fengwei Huo, Jinyi Lin (), Quanyou Feng and Wei Huang ()
Additional contact information
Zhiqiang Zhuo: Nanjing Tech University (NanjingTech)
Mingjian Ni: Xiamen University
Ningning Yu: Nanjing Tech University (NanjingTech)
Yingying Zheng: Nanjing Tech University (NanjingTech)
Yingru Lin: Nanjing Tech University (NanjingTech)
Jing Yang: Nanjing Tech University (NanjingTech)
Lili Sun: Sun Yat-sen University
Lizhi Wang: Nanjing Tech University (NanjingTech)
Lubing Bai: Nanjing Tech University (NanjingTech)
Wenyu Chen: Nanjing Tech University (NanjingTech)
Man Xu: Nanjing University of Posts & Telecommunications
Fengwei Huo: Nanjing Tech University (NanjingTech)
Jinyi Lin: Nanjing Tech University (NanjingTech)
Quanyou Feng: Nanjing University of Posts & Telecommunications
Wei Huang: Nanjing Tech University (NanjingTech)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Fully π-conjugated polymers with rigid aromatic units are promising for flexible optoelectronic devices, but their inherent brittleness poses a challenge for achieving high-performance, intrinsically stretchable fully π-conjugated polymer. Here, we are establishing an external-plasticizing strategy using semiconductor fluid plasticizers (Z1 and Z2) to enhance the optoelectronic, morphological, and stretchable properties of fully π-conjugated polymer films for flexible light-emitting diodes. The synergistic effect of hierarchical structure and optoelectronic properties of Z1 in poly(9,9-di-n-octylfluorene-alt-benzothiadiazole) (F8BT) films enable excellent stretchable deformability (~25%) and good conductivity. PLEDs based on F8BT/Z1 films show stable electroluminescence and efficiency under 15% stretch and 100 cycles at 10% strain, revealing outstanding stress tolerance. This strategy is also improving the stretchable properties of polymers like poly(9,9-di-n-octylfluorenyl-2,7-diyl) (PFO) and poly(2-methoxy-5(2′-ethyl)hexoxy-phenylenevinylene) (Super Yellow), demonstrating its general applicability. Therefore, this strategy can provide effective guidance for designing high-performance stretchable fully π-conjugated polymers films for flexible electronic devices.

Date: 2024
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DOI: 10.1038/s41467-024-50358-1

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