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Here, the photophysical functions of A\u2010site cations in manganese bromides are revealed, and design dimethylamino\u2010functionalized A\u2010site cations to modulate both phonon dynamics, film morphology, and energy level alignment, enabling unprecedented efficiency in solution\u2010processed green\u2010emitting lead\u2010free metal halide devices. Appropriately attaching of dimethylamino groups to benzene rings not only builds p\u2013\n                    <jats:italic>\u03c0<\/jats:italic>\n                    conjugation that increases the rigidity of PPh\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>+<\/jats:sup>\n                    A\u2010site cations, but also weakens hazardous van der Waals interaction, which suppresses A\u2010site related nonradiative recombination. Importantly, methyl groups in dimethylamino groups enhance the flexibility of the A\u2010site cation, which suppresses the formation of grain boundaries. Moreover, dimethylamino groups regulate the energy levels of PPh\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>+<\/jats:sup>\n                    , reducing charge injection barriers. Notably, electroluminescent devices are achieved with a maximum external quantum efficiency (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 12.0% and large\u2010area emission of 4 \u00d7 4 cm\n                    <jats:sup>2<\/jats:sup>\n                    , underscoring their potential for next\u2010generation display technologies.\n                  <\/jats:p>","DOI":"10.1002\/adma.202510599","type":"journal-article","created":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T03:39:40Z","timestamp":1760153980000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Cation\u2010Mediated Low\u2010Frequency Phonon Suppression in Lead\u2010free Manganese Halides for High\u2010efficiency Green Light\u2010emitting Diodes"],"prefix":"10.1002","volume":"38","author":[{"given":"Bing","family":"Han","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yizhao","family":"Qing","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Runnan","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhuoxu","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Dang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qianglong","family":"Lv","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuyi","family":"Han","sequence":"additional","affiliation":[{"name":"Key Laboratory of Theoretical &amp; Computational Photochemistry of Ministry of Education College of Chemistry Beijing Normal University  Beijing 100875 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Theoretical &amp; Computational Photochemistry of Ministry of Education College of Chemistry Beijing Normal University  Beijing 100875 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peijin","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changxiao","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shihao","family":"Sha","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qirui","family":"Hou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biao","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2700-4725","authenticated-orcid":false,"given":"Zhan'ao","family":"Tan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology  Beijing 100029 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,10]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201904862"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202109495"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-022-05304-w"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202400421"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-024-07531-9"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.ado5645"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.trechm.2019.04.004"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/aelm.201500089"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2CC06680G"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202310065"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1QM00288K"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/C9NR01031A"},{"key":"e_1_2_9_13_1","first-page":"300","volume":"5","author":"Ghosh S.","year":"2019","journal-title":"Chem. 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