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Accelerating radiative transitions via the Purcell effect in optical microcavities offers a solution, but conventional flexible semitransparent electrodes struggle to balance microcavity\u2010enhanced PLQY and light outcoupling efficiency (OCE). We address this with a micro\u2010structured magnesium\u2010bismuth (Mg\u2010Bi) alloy electrode offering 40% broadband transmittance (400\u20131600\u00a0nm) and conductivity (29.3 \u03a9 \u25fb\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). The alloy's low real permittivity supports less confined surface plasmon polariton and, with a capping layer, yields 60% NIR transmittance in an organic\u2010to\u2010air optical configuration. This design achieves 42.3% OCE and elevates the PLQY of a 704\u00a0nm NIR emitter to 71.8%, enabling flexible NIR\u2010OLEDs with a record 24.3% external quantum efficiency. The synergy of optical engineering and conductive microstructures establishes a universal strategy for high\u2010efficiency flexible NIR optoelectronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202518212","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T20:44:41Z","timestamp":1773002681000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["High\u2010Performance Flexible Near\u2010Infrared Organic Light\u2010Emitting Diodes with a Heterogeneous Alloy Semitransparent Electrode"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-7791-4174","authenticated-orcid":false,"given":"Mengxin","family":"Xu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Integrated Optoelectronics JLU Region College of Electronic Science and Engineering Jilin University  Changchun 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