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The main challenge lies in achieving precise morphological control. Herein, we exploit the coffee\u2010ring effect in evaporating droplets as a spatiotemporal confinement strategy to direct the self\u2010assembly of 9,10\u2010bis(phenylethynyl)anthracene (BPEA) MCs. Real\u2010time optical microscopy reveals that the coffee\u2010ring effect generates ring\u2010shaped deposits on the electrode surface, where crystals exhibit three distinct distribution patterns from the edge to the center, namely orderly packing at the periphery, well\u2010separated dispersion and clustered aggregation in the inner portion. The well\u2010separated crystals in the intermediate zone enable in situ ECL imaging of four distinct morphologies, including rod\u2010like, etched, needle\u2010like, and branched, within a single assembly. Notably, rod\u2010like crystals exhibit strong waveguiding behavior with enhanced ECL emission at their terminals, whereas branched crystals show no obvious waveguiding effect. This work provides new insights into the correlation between crystal morphology and ECL performance at the single entity level.<\/jats:p>","DOI":"10.1002\/smtd.71024","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T05:05:13Z","timestamp":1788930313000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Confined Electrochemiluminescence Generation From Individual Molecular Crystals Assembled via the Coffee\u2010Ring Effect"],"prefix":"10.1002","volume":"10","author":[{"given":"Chunyan","family":"Liu","sequence":"first","affiliation":[{"name":"Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li","family":"Shen","sequence":"additional","affiliation":[{"name":"Collaborative Innovation Center of Biomedical Functional 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