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However, the development of NIR phosphors has been limited by a strategy that prioritizes internal quantum efficiency (IQE) while leaving absorption efficiency (AE) largely underexplored, causing the external quantum efficiency (EQE) to plateau. Here, we break from this convention and demonstrate an absorption\u2010engineered, single\u2010component solid solution, Cs\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>0.92<\/jats:sub>\n                    Mo\n                    <jats:sub>0.08<\/jats:sub>\n                    Cl\n                    <jats:sub>6<\/jats:sub>\n                    , designed under a new strategy that synergistically optimizes AE and IQE. The material delivers broadband NIR emission spanning 750\u20131350\u00a0nm with an IQE of 97.4% and a record\u2010high EQE of 65.6% for broadband NIR phosphors beyond 900\u00a0nm. This performance originates from the synergistic effect of strong photon harvesting, low phonon energy (138\u00a0cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), and a Type\u2010I band alignment, as confirmed by experimental and theoretical studies. Notably, Cs\n                    <jats:sub>2<\/jats:sub>\n                    Te\n                    <jats:sub>0.92<\/jats:sub>\n                    Mo\n                    <jats:sub>0.08<\/jats:sub>\n                    Cl\n                    <jats:sub>6<\/jats:sub>\n                    maintains outstanding stability, enabling NIR LED fabrication on 395\u00a0nm UV chips. The fabricated device achieves a electro\u2010optical conversion efficiency of 15.2% and an optical output of 112\u00a0mW, setting a new benchmark for NIR light sources. Practical demonstrations in ethanol concentration detection, solar energy harvesting, night vision, and anti\u2010counterfeiting confirm its utility, thereby establishing a transformative design platform for next\u2010generation optoelectronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202520149","type":"journal-article","created":{"date-parts":[[2025,12,26]],"date-time":"2025-12-26T13:54:17Z","timestamp":1766757257000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Unlocking High External Quantum Yield for Broadband Near\u2010Infrared Emission From Lead\u2010Free Perovskite Variant Solid Solutions Cs\n                    <sub>2<\/sub>\n                    Te\n                    <sub>1\u2012<\/sub>\n                    <i>\n                      <sub>x<\/sub>\n                    <\/i>\n                    Mo\n                    <i>\n                      <sub>x<\/sub>\n                    <\/i>\n     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