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Rigid confinement is the general approach for achieving purely organic RTP, but it encounters the inherent challenge of balancing effective triplet\u2010state confinement with the required material flexibility and processability for advanced device integration, as well as the lack of on\u2010demand regulation of phosphorescence. Herein, solution\u2010processable, cross\u2010linked liquid crystal nanoparticles (LCNPs) featuring programmable phosphorescent lifetime are developed as a universal strategy for RTP activation. TPB\u2010doped LCNPs achieve efficient green RTP with a lifetime of up to 642.51\u00a0ms, and their afterglow duration can be precisely controlled by adjusting the LC network crosslinking density. In addition, the order and anisotropy of the LC network endow the fluorescent dye ND\u2010PTCDI with different aggregate behaviors, enabling a switchable emission color from green to red. Such LCNPs featuring excellent aqueous dispersibility and lifetime\u2010 and color\u2010resolved optical outputs can serve as security inks for multi\u2010level information encryption.<\/jats:p>","DOI":"10.1002\/smll.76148","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T16:31:12Z","timestamp":1791477072000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Solution\u2010Processable Cross\u2010Linked Liquid Crystal Nanoparticles Enable Security Inks for Programmable Luminescence Lifetime and Color Coding"],"prefix":"10.1002","author":[{"given":"Ziyuan","family":"Li","sequence":"first","affiliation":[{"name":"Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers and College of Materials Science and Engineering Beijing University of Chemical Technology  Beijing 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