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Adv."],"published-print":{"date-parts":[[2026,4,24]]},"abstract":"<jats:p>Smart textiles face inherent compromises between functionality and wearability due to rigid electronics and complex circuitry. Here, we introduce a touch-luminescence (TouchLumi) fiber that overcomes this trade-off by enabling chip-free, real-time tactile-visual interaction via electric field confinement. The fiber integrates a conductive core, a high-permittivity poly(vinylidene fluoride) hexafluoropropylene\/barium titanate dielectric layer, and a copper ion\u2013doped zinc sulfide electroluminescent sheath. Upon touch or conductor-induced capacitive coupling, dielectric mismatch concentrates the electric field within the emissive layer, driving localized and simultaneous high-brightness emission at a portable 3-volt power without requiring any other external field or support. This synergistic design merges tactile signal detection and visual feedback into a unified closed-loop system. Crucially, TouchLumi fibers are continuously producible with robust washability and textile compatibility, supporting digital embroidery and large-area machine weaving. We demonstrated its applications, including selective pattern illumination via wet-fingertip activation, multipoint responsive interfaces, and optical messaging through a keyboard textile. TouchLumi fiber enables intuitive tactile-visual interaction that unlocks transformative applications in assistive and inclusive communications.<\/jats:p>","DOI":"10.1126\/sciadv.aec5676","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T17:59:52Z","timestamp":1776880792000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":1,"title":["Closed-loop tactile-visual interactivity via chip-free luminescent fibers enabled by capacitive coupling"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-7360-4470","authenticated-orcid":true,"given":"Xun-En","family":"Wu","sequence":"first","affiliation":[{"name":"Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. 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