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Here, an MR\u2010TADF emitter incorporating\n                    <jats:bold>pillar[5]arene<\/jats:bold>\n                    to suppress aggregation is reported. The \u201cbutterfly\u201d shaped emitter\n                    <jats:bold>BN\u2010APOPV<\/jats:bold>\n                    is constructed by tethering\n                    <jats:bold>pillar[5]arene<\/jats:bold>\n                    to a\n                    <jats:bold>tCzBN<\/jats:bold>\n                    MR\u2010TADF skeleton and employing an aryl bridge for connection. Intramolecular energy transfer and TADF type CzAcSF host materials are used to harvest excitons and accelerate RISC.\n                    <jats:bold>BN\u2010APOPV<\/jats:bold>\n                    exhibits sky\u2010blue emission (\u03bb\n                    <jats:sub>PL<\/jats:sub>\n                    of 491\u00a0nm) with a full\u2010width at half\u2010maximum of 33\u00a0nm and a RISC rate constant (\n                    <jats:italic>k<\/jats:italic>\n                    <jats:sub>RISC<\/jats:sub>\n                    ) of 1.37 \u00d7 10\n                    <jats:sup>6<\/jats:sup>\n                    s\n                    <jats:sup>\u22121<\/jats:sup>\n                    in a 1 wt% doped CzAcSF film. As the doping concentration is increased from 1 to 5 wt%, the photoluminescence quantum yield increases from 76% to 86%. Solution\u2010processed organic light\u2010emitting diodes prepared with\n                    <jats:bold>BN\u2010APOPV<\/jats:bold>\n                    exhibited almost the same maximum external quantum efficiencies (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 9% at doping concentrations ranging from 1 to 5 wt%. In contrast, the device doped with the emitter\n                    <jats:bold>BN\u2010AOPV<\/jats:bold>\n                    (prepared without\n                    <jats:bold>pillar[5]arene<\/jats:bold>\n                    ) suffers from severe aggregation\u2010caused quenching with EQE\n                    <jats:sub>max<\/jats:sub>\n                    decreasing from 7.0 to 2.7% as the doping concentration increases from 1 to 5 wt%.\n                  <\/jats:p>","DOI":"10.1002\/smll.75663","type":"journal-article","created":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T10:29:00Z","timestamp":1788776940000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Reduced Concentration Quenching of Multi\u2010Resonant Thermally Activated Delayed Fluorescence Emitter Incorporating Pillar[5]Arene Macrocycle"],"prefix":"10.1002","author":[{"given":"Zhihong","family":"Sun","sequence":"first","affiliation":[{"name":"National Center for International Cooperation and Disciplinary Innovation in Sustainable Chemical Engineering and Technology, School of Optoelectronic Materials and Technology , Key Laboratory of Flexible Optoelectronic Materials and Technology (Ministry of Education) Jianghan University  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8977-6160","authenticated-orcid":false,"given":"Qiyin","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Flexible Electronics (IFE, Future Technologies), Future Display Institute of Xiamen, Tan Kah Kee Innovation Laboratory Xiamen University  Xiamen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Fang","sequence":"additional","affiliation":[{"name":"National Center for International Cooperation and Disciplinary 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