Chen Wenyu, Yu Ningning, Gong Huaqiang, Li Mengyuan, Xu Weifeng, Zhuo Zhiqiang, Sun Zhiyang, Ni Mingjian, Huang Wenxin, Yang Jing, Lin Yingru, Wang Lizhi, Li Hao, Liang Xinyu, Sun Ning, Sun Lili, Bai Lubing, Han Yamin, Tao Youtian, Xu Man, Yin Chengrong, An Xiang, Lin Jinyi, Huang Wei
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, China.
The Institute of Flexible Electronics, (IFE Future Technologies), Xiamen University(XMU), 422 Siming South Road, Xiamen, Fujian, 361005, China.
Adv Mater. 2024 Jul;36(30):e2402708. doi: 10.1002/adma.202402708. Epub 2024 Jun 14.
Emerging intrinsically flexible fully π-conjugated polymers (FπCPs) are a promising functional material for flexible optoelectronics, attributed to their potential interchain interpenetration and entanglement. However, the challenge remains in obtaining elastic-plastic FπCPs with intrinsic robust optoelectronic property and excellent long-term and cycling deformation stability simultaneously for applications in deep-blue flexible polymer light-emitting diodes (PLEDs). This study, demonstrates a series of elastic-plastic FπCPs (P1-P4) with an excellent energy dissipation capacity via side-chain internal plasticization for the ultra-deep-blue flexible PLEDs. First, the freestanding P1 film exhibited a maximum fracture strain of 34.6%. More interestingly, the elastic behavior is observed with a low strain (≤10%), and the stretched film with a high deformation (>10%) attributed to plastic processing revealed the robust capacity to realize energy absorption and release. The elastic-plastic P1 film exhibits outstanding ultra-deep-blue emission, with an efficiency of 56.38%. Subsequently, efficient PLEDs are fabricated with an ultra-deep-blue emission of CIE (0.16, 0.04) and a maximum external quantum efficiency of 1.73%. Finally, stable and efficient ultra-deep-blue electroluminescence are obtained from PLEDs based on stretchable films with different strains and cycling deformations, suggesting excellent elastic-plastic behavior and deformation stability for flexible electronics.
新兴的本征柔性全π共轭聚合物（FπCPs）是一种很有前途的柔性光电子功能材料，这归因于它们潜在的链间相互渗透和缠结。然而，要同时获得具有本征稳健光电性能、优异的长期和循环变形稳定性的弹塑性FπCPs，以应用于深蓝色柔性聚合物发光二极管（PLEDs），仍然面临挑战。本研究通过侧链内增塑展示了一系列用于超深蓝色柔性PLEDs的具有优异能量耗散能力的弹塑性FπCPs（P1-P4）。首先，独立的P1薄膜表现出34.6%的最大断裂应变。更有趣的是，在低应变（≤10%）下观察到弹性行为，而经过塑性加工的高变形（>10%）拉伸薄膜显示出实现能量吸收和释放的强大能力。弹塑性P1薄膜表现出出色的超深蓝色发射，效率为56.38%。随后，制备出具有CIE（0.16, 0.04）超深蓝色发射和1.73%最大外量子效率的高效PLEDs。最后，基于具有不同应变和循环变形的可拉伸薄膜的PLEDs获得了稳定且高效的超深蓝色电致发光，表明其在柔性电子学方面具有优异的弹塑性行为和变形稳定性。
