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These defects may result in device instability, performance loss, and failure. Herein, a thermoplastic functional strategy is proposed for manufacturing high\u2010performance stretchable semiconducting polymers with excellent strain\u2010tolerance capacities for flexible electronic devices. Internal plasticization is used to obtain a thermoplastic light\u2010emitting polymer (N2) that can suppress intralayer tensile fracture and compressive separation to enhance the deformation stability of flexible thin\u2010film optoelectronic devices, enabling outstanding energy dissipation capacity under stress. The thermoplastic films exhibit stable and efficient ultra\u2010deep\u2010blue emission with a high efficiency of \u224890% and chromaticity coordinates of (0.16, 0.04). Moreover, the N2\u2010based rigid and flexible polymer light\u2010emitting diodes (PLEDs) exhibit stable ultra\u2010deep\u2010blue electroluminescence properties with high EQEs of \u22482.4% and 1.9%, respectively. Compared with devices based on brittle PODPF, flexible PLEDs based on thermoplastic films effectively suppress performance degradation after hundreds of cycles of bending fatigue, even under extremely rigid conditions. Introducing intrinsically thermoplastic semiconducting polymers in flexible electronic devices can thus substantially enhance their operational stability under deformation.<\/jats:p>","DOI":"10.1002\/adma.202411547","type":"journal-article","created":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T03:00:02Z","timestamp":1736737202000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["High\u2010Efficiency Intrinsically Thermoplastic Semiconducting Polymer with Excellent Strain\u2010Tolerance Capacity for Flexible Ultra\u2010Deep\u2010Blue Polymer Light\u2010Emitting Diodes"],"prefix":"10.1002","volume":"37","author":[{"given":"Mingjian","family":"Ni","sequence":"first","affiliation":[{"name":"The Institute of Flexible Electronics (IFE Future Technologies) Xiamen University  422 Siming South Road Xiamen 361005 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiqiang","family":"Zhuo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LOFE) &amp; 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