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Peripheral segments are often used to decorate\/fuse MR skeletons and modulate the photophysics but they can also cause unwanted spectral broadening. Herein, a narrowband MR emitter\n                    <jats:bold>ICzDBA<\/jats:bold>\n                    by fusing an MR\u2010featured donor segment indolocarbazole into a double\u2010borylated MR skeleton is developed. In\n                    <jats:bold>ICzDBA<\/jats:bold>\n                    , the nitrogen atom located away from the core benzene ring can also contribute to the generation of the overall MR\u2010featured distribution through the long\u2010range conjugation effect, along with the other boron\/nitrogen atoms on the phenyl center. Thus,\n                    <jats:bold>ICzDBA<\/jats:bold>\n                    in toluene displays a narrowband emission peaking at 507\u00a0nm with a full width at half maximum of merely 20\u00a0nm (0.09\u00a0eV). Moreover, organic light\u2010emitting diode devices using\n                    <jats:bold>ICzDBA<\/jats:bold>\n                    emitter exhibit ultrapure green emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.27, 0.70) and a high external quantum efficiency of 32.5%. These results manifest the importance of MR characters of peripheral decorations\/fusions in preserving the narrowband features of MR skeletons, which provides a solution for further expanding MR structures with well\u2010maintained narrowband characters.\n                  <\/jats:p>","DOI":"10.1002\/smll.202312098","type":"journal-article","created":{"date-parts":[[2024,3,10]],"date-time":"2024-03-10T15:58:46Z","timestamp":1710086326000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Expanding Multiple\u2010Resonance Structure of a Double\u2010Borylated Skeleton by Fusing with Indolocarbazole a Multiple\u2010Resonance Donor for Narrowband Green Emission"],"prefix":"10.1002","volume":"20","author":[{"given":"Mo\u2010Yuan","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Wu","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao\u2010Chun","family":"Fan","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Huang","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jia","family":"Yu","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9860-2282","authenticated-orcid":false,"given":"Kai","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"},{"name":"Jiangsu Key Laboratory for Carbon\u2010Based Functional Materials &amp; Devices Soochow University  Suzhou Jiangsu 215123 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6732-2499","authenticated-orcid":false,"given":"Xiao\u2010Hong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu 215123 P. R. China"},{"name":"Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University  Suzhou Jiangsu 215123 P. R. 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