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However, the obstinate spectral broadening phenomenon upon aggregation limits the practical application of organic narrowband emissive materials. Here, a referable strategy on conformation engineering is proposed in a central 8\n                    <jats:italic>\u03c0<\/jats:italic>\n                    -electron system with narrowband emissions in both solution and aggregate. Owing to the synergistic effect of strain-release-driven conformational planarity in ground state and excited-state aromaticity-driven planarity, PDBP-\n                    <jats:italic>b,i<\/jats:italic>\n                    exhibits minimal structural change between the S\n                    <jats:sub>0<\/jats:sub>\n                    and S\n                    <jats:sub>1<\/jats:sub>\n                    states, resulting in narrowband emission in solution with a full width at half maximum (FWHM) of 35\u2009nm\/0.24\u2009eV. While in aggregate, the cross dipole stacking mode further confines molecular conformation and restricts high-frequency vibration, additionally narrowing with a record-small FWHM of 13\u2009nm\/0.08\u2009eV. The concept of aggregation-induced ultra-narrowband emission is proposed, which also offers advantages in electroluminescence to exhibit a small FWHM of 13\u2009nm and remaining stable as the concentration increases. These results provide new insights and instructive guidance for the design of organic narrowband emitters.\n                  <\/jats:p>","DOI":"10.1038\/s41377-026-02277-7","type":"journal-article","created":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T06:14:50Z","timestamp":1781072090000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Molecular conformation engineering in central 8\u03c0-electron system toward unique aggregation-induced ultra-narrowband emission with a FWHM of 13\u2009nm"],"prefix":"10.1038","volume":"15","author":[{"given":"Lu","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4069-1769","authenticated-orcid":false,"given":"Han","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenfa","family":"Xiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bingzhu","family":"Ma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baoxi","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"He","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7013-1378","authenticated-orcid":false,"given":"Guanjun","family":"Xiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3215-1255","authenticated-orcid":false,"given":"Bo","family":"Zou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baolei","family":"Tang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0219-3948","authenticated-orcid":false,"given":"Hongyu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacky W. 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