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Therefore, a PeLED with a quasi\u20102D perovskite vertically stacked on a high\u2010mobility inorganic electron\u2010transport layer is highly anticipated but has yet to be achieved. Here, we introduce branched guanidinium cations (GA\n                    <jats:sup>+<\/jats:sup>\n                    ) and non\u2010protonic phosphonium, (2\u2010aminoethyl) triphenyl\u2010 cations (PAT\n                    <jats:sup>+<\/jats:sup>\n                    ) to direct the vertical growth of quasi\u20102D emitters on a high\u2010conductivity electron\u2010transport layer, ZnMgO, enabling high\u2010performance pure\u2010red PeLEDs that exhibit a maximum luminance of 65\u00a0875\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    and an external quantum efficiency of 14.63% even at a high brightness of 49\u00a0080\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . Impressively, the low driving voltage, enabled by efficient carrier transport, also yields an operational half\u2010lifetime of 5528 h at an initial luminance of 100\u00a0cd m\n                    <jats:sup>\u22122<\/jats:sup>\n                    , which represents the most stable pure\u2010red PeLED reported to date.\n                  <\/jats:p>","DOI":"10.1002\/adma.75251","type":"journal-article","created":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T07:58:42Z","timestamp":1791100722000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Vertical Quasi\u20102D Perovskite on ZnMgO Enables High\u2010Performance Pure\u2010Red PeLEDs"],"prefix":"10.1002","author":[{"given":"Guan\u2010Jie","family":"Ding","sequence":"first","affiliation":[{"name":"Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China  Hefei China"},{"name":"Department of Applied 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