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In this contribution, a proof\u2010of\u2010concept of centrosymmetric molecular strategy fused with quadruple boron\u2013nitrogen heteroarenes is proposed to develop ultra\u2010narrowband long\u2010wavelength MR\u2010TADF emitters. Thus, two MR\u2010TADF emitters, called DCz\u2010MR and DAn\u2010MR, are prepared and characterized. Compounds DCz\u2010MR and DAn\u2010MR exhibit the emission peaks at 562\u00a0nm and 518\u00a0nm in toluene solution, respectively. Small full\u2010width at half\u2010maximum (FWHM) of only 16\u00a0nm (0.063\u00a0eV) for DCz\u2010MR and 12\u00a0nm (0.055\u00a0eV) for DAn\u2010MR are obtained in toluene, especially 14.2\u00a0nm (0.058\u00a0eV) for DCz\u2010MR and 8.2\u00a0nm (0.040\u00a0eV) for DAn\u2010MR in hexane. In solution\u2010processed phosphorescence\u2010sensitized organic light\u2010emitting diodes, DAn\u2010MR delivers a maximum external quantum efficiency of 24.8% with an electroluminescence FWHM of 27\u00a0nm. This research work provides a new method for designing ultra\u2010narrowband long\u2010wavelength MR\u2010TADF emitters.<\/jats:p>","DOI":"10.1002\/anie.9341082","type":"journal-article","created":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T15:57:47Z","timestamp":1792425467000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Centrosymmetric Molecular Strategy With Quadruple Boron\u2013Nitrogen Heteroarenes Enabling Efficient Ultra\u2010Narrowband Emission"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-4069-3928","authenticated-orcid":false,"given":"Lei","family":"Hua","sequence":"first","affiliation":[{"name":"School of Materials Science &amp; Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Engineering Laboratory of Light\u2010Electricity\u2010Heat Energy\u2010Converting Materials and Applications Changzhou University  Changzhou P. 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