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Here, we circumvent this dilemma by copolymerizing diamines containing B\/N\u2010fused MR emitters (DBNCzNH\n                    <jats:sub>2<\/jats:sub>\n                    ) and phosphine oxide (P\u2550O) units (TPONH\n                    <jats:sub>2<\/jats:sub>\n                    ) with an aliphatic dianhydride (HBPDA), yielding a set of semi\u2010aromatic polyimides TPOBN\n                    <jats:italic>X<\/jats:italic>\n                    % (\n                    <jats:italic>X<\/jats:italic>\n                    \u00a0=\u00a01, 3, 5, and 10). Our design leverages two synergistic effects: the rigid nonconjugated aliphatic imide ring confines the MR chromophores in its intrinsic short\u2010range charge\u2010transfer regime, yielding narrow solution emission (full width at half maximum FWHM\u00a0=\u00a027\u201330\u00a0nm) and suppressing non\u2010radiative decay via conformational restriction; simultaneously, the P\u2550O units facilitate electron transport while their\n                    <jats:italic>\u03c3<\/jats:italic>\n                    \u2010bond insulation avoids perturbing the MR excited\u2010state manifold. The optimal TPOBN5% exhibits a minimal singlet\u2010triplet gap (\u0394\n                    <jats:italic>E<\/jats:italic>\n                    <jats:sub>ST<\/jats:sub>\n                    ) of 17.5\u00a0meV in neat film, favoring reverse intersystem crossing, and an 87% photoluminescence quantum yield in doped film. Solution\u2010processed OLEDs based on TPOBN5% achieve 25.3% EQE and 33\u00a0nm electroluminescence FWHM, representing record performance for nonconjugated MR\u2010TADF polymers. The synergy of rigid nonconjugated skeletons and polar transport units establishes a generalizable platform to address the efficiency\u2010color purity trade\u2010off.\n                  <\/jats:p>","DOI":"10.1002\/anie.7062566","type":"journal-article","created":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T03:57:07Z","timestamp":1792641427000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Solution\u2010Processable Semi\u2010Aromatic Polyimide MR\u2010TADF Materials for High\u2010Efficiency Narrowband OLEDs"],"prefix":"10.1002","author":[{"given":"Jinkun","family":"Bian","sequence":"first","affiliation":[{"name":"PCFM Lab, GD HPPC Lab, Guangdong Engineering Technology Research Centre for High\u2010Performance Organic and Polymer Photoelectric Functional Films, GBRCE for Functional Molecular Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, IGCME Sun Yat\u2010Sen University  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuxuan","family":"Li","sequence":"additional","affiliation":[{"name":"PCFM Lab, GD HPPC Lab, Guangdong Engineering Technology Research Centre for High\u2010Performance Organic and Polymer Photoelectric Functional Films, GBRCE for Functional Molecular Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, IGCME Sun Yat\u2010Sen University  Guangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Liu","sequence":"additional","affiliation":[{"name":"PCFM Lab, GD HPPC Lab, Guangdong Engineering Technology Research Centre for High\u2010Performance Organic and Polymer Photoelectric Functional Films, GBRCE for Functional Molecular Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, IGCME Sun Yat\u2010Sen University  Guangzhou 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