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We propose a skeletal rigidity strategy by fusing a five\u2010membered oxa\u2010heterocycle into a classical MR\u2010TADF skeleton (\n                    <jats:italic>\u03bd<\/jats:italic>\n                    \u2010DABNA), which simultaneously introduces rigidity enhancement via aromatic fusion and conformational locking. This approach resulted in an increased optical bandgap and the formation of intramolecular C\u2013H\u00b7\u00b7\u00b7O secondary interactions, and thus a systematic blue\u2010shift and narrowing emission spectrum. In toluene solution, the proof\u2010of\u2010concept molecule,\n                    <jats:italic>v<\/jats:italic>\n                    \u2010DABNA\u2010O, exhibits a narrowband deep\u2010blue emission peaking at 460.4\u00a0nm, with an ultra\u2010narrow full\u2010width at half maximum (FWHM) of 12.0\/69.8\u00a0nm\/meV. As a result, the\n                    <jats:italic>\u03bd<\/jats:italic>\n                    \u2010DABNA\u2010based device with a sensitizer achieves a maximum external quantum efficiency of 36.1%, a narrow electroluminescence spectrum with an FWHM of 17.9\/95.4\u00a0nm\/meV, and a Commission Internationale de l\u2019\u00c9clairage coordinate of (0.135, 0.091). Crucially, the device achieves a sharp suppression of high\u2010energy emission below 450\u00a0nm, directly addressing the imperative for visual safety. This work successfully addresses the trilemma in deep\u2010blue emitters by simultaneously achieving an ultra\u2010narrow emission bandwidth, a precisely positioned emission peak, and suppressed spectral intensity below 450\u00a0nm.\n                  <\/jats:p>","DOI":"10.1002\/anie.4464375","type":"journal-article","created":{"date-parts":[[2026,5,30]],"date-time":"2026-05-30T11:38:56Z","timestamp":1780141136000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Molecular Conformation\u2010Locking for Eye Care and Highly Efficient Narrowband Deep\u2010Blue Organic Electroluminescence"],"prefix":"10.1002","volume":"65","author":[{"given":"Xinliang","family":"Cai","sequence":"first","affiliation":[{"name":"State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry Jilin University  Changchun P. R. 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