{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T09:46:41Z","timestamp":1791884801068,"version":"4.3.4"},"reference-count":42,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T00:00:00Z","timestamp":1791849600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["62575110"],"award-info":[{"award-number":["62575110"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52473175"],"award-info":[{"award-number":["52473175"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100018806","name":"Department of Science and Technology of Hubei Province","doi-asserted-by":"publisher","award":["2024BAB014"],"award-info":[{"award-number":["2024BAB014"]}],"id":[{"id":"10.13039\/501100018806","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The development of emitters complying with the BT.2020 standard is crucial for ultra\u2010high\u2010definition (UHD) displays. However, achieving green multiple resonance thermally activated delayed fluorescence (MR\u2010TADF) emitters with both high efficiency and high color purity remains challenging. Here, two narrowband green MR\u2010TADF emitters,\n                    <jats:bold>Mes\u2010b\u2010ICzBN<\/jats:bold>\n                    and\n                    <jats:bold>Mes\u2010c\u2010ICzBN<\/jats:bold>\n                    , are developed via a molecular engineering strategy combining ICz isomer engineering and peripheral steric shielding. Both emitters fuse a rigid indolocarbazole (ICz) fragment and incorporate bulky mesitylene groups, with the ICz fragment extending the MR framework and limiting structural relaxation, and the mesitylene groups minimizing aggregation\u2010induced spectral broadening. Notably, isomer engineering of the ICz moiety enables fine\u2010tuning of the emission peak, yielding narrowband green emission closer to the BT.2020 green standard. Consequently, organic light\u2010emitting diodes (OLEDs) based on\n                    <jats:bold>Mes\u2010b\u2010ICzBN<\/jats:bold>\n                    and\n                    <jats:bold>Mes\u2010c\u2010ICzBN<\/jats:bold>\n                    exhibit CIE coordinates of (0.25, 0.70) and (0.22, 0.71), full widths at half maximum (FWHMs) of 26\u00a0nm and 27\u00a0nm, and maximum external quantum efficiencies (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 33.3% and 30.6%, respectively. Furthermore, by integrating these OLEDs with backplane drivers to construct active\u2010matrix (AM) OLED display panels, a high\u2010dynamic\u2010range pico\u2010projector prototype is successfully demonstrated. This synergistic molecular engineering strategy shows great potential for high\u2010color\u2010purity green MR\u2010TADF emitters in UHD displays.\n                  <\/jats:p>","DOI":"10.1002\/smll.76228","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T09:01:22Z","timestamp":1791882082000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High\u2010Performance Narrowband Green OLEDs Enabled by Indolocarbazole Isomer Engineering and Steric Shielding"],"prefix":"10.1002","author":[{"given":"Qiang","family":"Zhang","sequence":"first","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heng","family":"Xu","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaoying","family":"Wang","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongbo","family":"Shao","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-1825-9220","authenticated-orcid":false,"given":"Shan","family":"Huang","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8358-5440","authenticated-orcid":false,"given":"Jiajun","family":"Luo","sequence":"additional","affiliation":[{"name":"Wuhan National Laboratory For Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology  Wuhan People's Republic of 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