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Monoammonium cation ligands are widely employed for preparing quasi-2D perovskites. Herein, a mixed-ligand strategy combining monoammonium ligand 4-methoxyphenethylammonium hydrobromide with diammonium ligand 3,6-dioxa-1,8-octanediammonium hydrobromide (DADOBr2) is proposed for preparing blue-emissive quasi-2D perovskites. The diammonium ligand of DADOBr2 not only serves as a linker of adjacent inorganic layers to enhance the rigidity of the quasi-2D perovskite structure, but also favors passivating the uncoordinated Pb2+ ions with its oxygen atoms, therefore reducing the energy loss caused by exciton\u2013phonon coupling and trap-assisted nonradiative recombination. It is also found that the mixed-ligand strategy leads to random crystal orientation of quasi-2D perovskites, resulting in restricted carrier transport and increased radiative recombination rate. The mixed-ligand strategy significantly enhances the photoluminescence quantum yield of the blue quasi-2D perovskite film and boosts the external quantum efficiency of the blue device to 14.2%.<\/jats:p>","DOI":"10.1021\/acsami.6c12907","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T12:00:10Z","timestamp":1788350410000},"page":"47951-47960","source":"Crossref","is-referenced-by-count":0,"title":["Mixed Monoammonium\/Diammonium Ligands for High-Efficiency Sky-Blue Quasi-2D Perovskite Light-Emitting Diodes"],"prefix":"10.1021","volume":"18","author":[{"given":"Zexu","family":"Li","sequence":"first","affiliation":[{"name":"Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , , ,","place":["Changchun, P. R. China, 130022"]},{"name":"University of Science and Technology of China , , ,","place":["Hefei, P. R. 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