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Dynamic covalent chemistries, including Diels\u2013Alder cycloaddition, have been widely exploited to improve the mechanical robustness of polymeric materials, and stretchable light\u2010emitting polymers based on various dynamic interactions have also been extensively reported. Nevertheless, most existing dynamic crosslinking motifs contain polar functional groups that induce severe exciton quenching, which is particularly destructive to deep\u2010blue conjugated emitters. Here, we develop a low\u2010polarity Diels\u2013Alder dynamic topological strategy via end\u2010group functionalization specifically for deep\u2010blue light\u2010emitting conjugated polymers. Terminal vinyl\u2010functionalized deep\u2010blue polymer BTT is reacted with a bifunctional pyrrole crosslinker (Pyr\n                    <jats:sub>2<\/jats:sub>\n                    ), enabling continuous structural evolution from chain\u2010extended to crosslinked states by simply tuning crosslinker loading. The constructed low\u2010polarity dynamic network endows the films with a maximum fracture strain of \u223c30.7% and reversible stress recovery, while well preserving deep\u2010blue photoluminescence quantum yield. The optimized cross\u2010linked BTT\u20102 film achieves superior electroluminescent performance in flexible PLEDs, and device efficiency can be further boosted when the emissive layer is subjected to static pre\u2010strain. Blending BTT derivatives with MEH\u2010PPV is conducted as preliminary proof of material compatibility, which drastically increases the electroluminescence brightness of composite films.\n                  <\/jats:p>","DOI":"10.1002\/smll.75867","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T07:58:12Z","timestamp":1790150292000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dynamic Chain\u2010Extension and Crosslinking Behavior of End\u2010Group Functionalized Stretchable Deep\u2010Blue Light\u2010Emitting Conjugated Polymers for Flexible Light\u2010Emitting Diodes"],"prefix":"10.1002","author":[{"given":"Zhiyang","family":"Sun","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech)  Nanjing 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