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We present a strategy to fabricate stable, ligand\u2010free perovskite nanocrystal\u2010based composites by combining lead\u2010based metal\u2010organic frameworks (MOFs) with methylammonium acetate ionic liquid. This single\u2010step fabrication approach conducted in air yields compact, smooth (\u223c3\u00a0nm roughness), optically uniform composite films with a high perovskite incorporation level. These films exhibit broad spectral tunability over the 409\u2013752\u00a0nm range, high photoluminescence quantum yields of up to 80%, and exceptional stability, maintaining &gt; 80% emission intensity for over 190\u00a0h under elevated temperature and ultraviolet irradiation in air. Moreover, owing to efficient confinement and suppressed nonradiative losses, optimized composite films deliver a record modal gain of 1825 cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    at 350 \u00b5J\u2219cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    , which is among the highest values reported for perovskite nanocrystals. Our findings establish MOF\u2010derived perovskite nanocrystal composites as a scalable platform for high\u2010performance optoelectronics, paving the way toward practical perovskite\u2010based lasers.\n                  <\/jats:p>","DOI":"10.1002\/smll.76085","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T10:50:52Z","timestamp":1791370252000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High Optical Gain in Stable MOF\u2010Derived Composite Films Based on Perovskite Nanocrystals"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8319-1492","authenticated-orcid":false,"given":"Stepan","family":"Pozdniakov","sequence":"first","affiliation":[{"name":"Qingdao Innovation and Development Center Harbin Engineering University  Qingdao Shandong China"},{"name":"School of Physics and Engineering ITMO University  Saint Petersburg Russian 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