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Solution\u2010processable undoped emission layers represent the ideal device architecture to enhance operational lifetime and reduce fabrication complexity. However, it remains challenging to achieve narrowband emission in solid\u2010state, which requires reducing vibrational coupling and suppressing the \u03c0\u2013\u03c0 stacking interactions between aromatic structures. Herein, we developed solid\u2010state red carbon quantum frameworks (SSR\u2010CQFs) that exhibit narrowband thermally activated delayed fluorescence (TADF) with a peak at 635\u00a0nm, a small full width at half maximum of 39\u00a0nm, and a high photoluminescence quantum yield of 64% in neat films. This exceptional optical performance originates from the designed undulating two\u2010dimensional framework of SSR\u2010CQFs, in which chromophores are covalently interconnected by flexible alkyl chains. The structure simultaneously confines \u03c0\u2010electrons within individual chromophore units, prevents charge\u2010transfer state formation, and suppresses interlayer \u03c0\u2013\u03c0 stacking. Consequently, solution\u2010processed undoped LEDs based on SSR\u2010CQFs achieve high\u2010color\u2010purity red emission (CIE: 0.658, 0.326) with a maximum external quantum efficiency (EQE\n                    <jats:sub>max<\/jats:sub>\n                    ) of 8.04%, and demonstrate exceptional stability (\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>85<\/jats:sub>\n                    of 116\u00a0h) under high\u2010temperature operation. This paper presents a novel strategy to achieve solution\u2010processable undoped carbon\u2010based LEDs that achieve combination of narrowband emission, high efficiency, and high operational stability.\n                  <\/jats:p>","DOI":"10.1002\/anie.2568667","type":"journal-article","created":{"date-parts":[[2026,4,14]],"date-time":"2026-04-14T06:47:13Z","timestamp":1776149233000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Solid\u2010State Red Carbon Quantum Frameworks With Narrowband Thermally Activated Delayed Fluorescence for Undoped LEDs With High\u2010Temperature Operational Stability"],"prefix":"10.1002","volume":"65","author":[{"given":"Xianzhi","family":"Song","sequence":"first","affiliation":[{"name":"College of Chemistry Key Laboratory of Theoretical &amp; Computational Photochemistry of Ministry of Education Beijing Normal University  Beijing 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