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However, heteroatom\u2010containing fully \u03c0\u2010conjugated molecules (F\u03c0CMs) often undergo strong\n                    <jats:italic>\u03c0<\/jats:italic>\n                    \u2010\n                    <jats:italic>\u03c0<\/jats:italic>\n                    stacking, leading to pronounced intramolecular \u03c0\u2010electron hybridization and intermolecular charge\u2010transfer interactions. These effects can induce nonradiative decay and redshifted emission, which are unfavorable for deep\u2010blue device applications. Herein, we report an efficient ultra\u2010deep\u2010blue light\u2010emitting elastic molecular crystal based on hydrocarbon semiconducting fully \u03c0\u2010conjugated ter(9,9\u2010diarylfluorene)s (DM3C8; molecular weight &gt; 1300\u00a0g\/mol), enabling flexible ultra\u2010deep\u2010blue amplified spontaneous emission (ASE) waveguides. Benefiting from the synergistic effects of flexible side chains and bulky steric hindrance, DM3C8 elastic crystals exhibit outstanding ultra\u2010deep\u2010blue emission with CIE coordinates of (0.16, 0.06) and a photoluminescence efficiency of \u223c51%. This performance is attributed to single\u2010chromophore emission with suppressed\n                    <jats:italic>\u03c0<\/jats:italic>\n                    \u2010\n                    <jats:italic>\u03c0<\/jats:italic>\n                    interactions. The unique piezochromic emission behavior of DM3C8 elastic crystals is further investigated, revealing reversible and dynamic intermolecular networks. Finally, DM3C8 elastic crystals function as low\u2010threshold flexible ultra\u2010deep\u2010blue ASE optical waveguides, exhibiting low optical loss coefficients in both straight (\u03b1 &lt; 0.07 db\/mm) and bent (\u03b1 &lt; 0.08 db\/mm) configurations. These results indicate that short\u2010range structural perturbations have minimal impact on optical propagation.\n                  <\/jats:p>","DOI":"10.1002\/adma.202518687","type":"journal-article","created":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T06:51:39Z","timestamp":1773211899000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Elastic Organic Crystals of Semiconducting Hydrocarbon Fully \u03c0\u2010Conjugated Molecules for Efficient Flexible Ultra\u2010Deep\u2010Blue Amplified Spontaneous Emission Waveguides"],"prefix":"10.1002","volume":"38","author":[{"given":"Xinyu","family":"Du","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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