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However, realizing long\u2010lived fluid RTP remains highly challenging because the dynamic nature of fluid media enables extensive molecular motion and oxygen permeation, which readily dissipate chromophore triplet excitons via nonradiative pathways. Herein, we report a universal strategy for achieving room\u2010temperature phosphorescent polymer fluids through chromophore confinement within microphase\u2010separated domains of block copolymers. The localized confinement environments generated by rigid segments surrounding the chromophores effectively suppress nonradiative transitions and stabilize triplet excitons in the fluid state. Consequently, the resulting polymer fluids exhibit tunable viscous flow behavior and ultralong phosphorescence lifetimes of up to 364\u00a0ms. Moreover, the generality of the strategies is demonstrated by modulating chromophore structures and achieving a series of multicolor RTP polymer fluids. Leveraging their excellent fluidity and persistent afterglow emission, these materials demonstrate significant potential for adaptive afterglow displays and visualization detection. This work establishes an effective approach for constructing fluidic RTP polymer materials and offers new insights into the design of functional RTP materials.<\/jats:p>","DOI":"10.1002\/anie.6514261","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T05:11:21Z","timestamp":1790658681000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Long\u2010Lived Organic Room\u2010Temperature Phosphorescent Fluids via Chromophore Confinement"],"prefix":"10.1002","author":[{"given":"Jingyi","family":"Shan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Flexible Electronics (LoFE) &amp; School of Flexible Electronics Northwestern Polytechnical University  Xi'an P. R. 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