The afterglow color of the materials was conveniently tuned to red by pre-treatment with RhB via the TS-FRET process (Fig. ). Given the facile assembly, the B-fibers or B-fibers/RhB were incorporated in low-cost demonstration prototypes in given large scales (Fig. ). They included luminescent textiles (promising emissive materials for electronic displays and smart sensors) (Fig. ). In addition, B-fibers were used to prepare anti-counterfeit embroidery textiles (afterglow emission was observed from the given features after removing the UV irradiation, Fig. ). In order to demonstrate the applicability of the system, an afterglow paper sheet was prepared with B-fibers. The paper sheet was flexible and exhibited afterglow emission after UV irradiation (Fig. and). The afterglow was investigated for anticounterfeiting applications, e.g., by printing with a commercial printer. Importantly, the afterglow emission remained after paper printing (Fig. ). As a control, no afterglow emission was observed for normal printed paper (Supplementary Fig. ). Encrypted documents were created by taking advantage of the TS-FRET between B-fiber and RhB (Fig. and Fig. ). In this way, on UV irradiation, the paper displayed a red afterglow pattern and given pre-designed images were observed after switching off the UV light (Fig. and Fig. ). As control, no afterglow emission was observed when printing RhB on commercially available paper (Supplementary Fig. and Supplementary Fig. ). Finally, B-fibers were physically blended with polyvinyl alcohol (PVA) to prepare transparent and flexible RTP films with afterglow emission (Fig. ) and as also building blocks for producing RTP foams with afterglow emission (Fig. ). Overall, the results confirmed afterglow and significant potential for materials incorporating B-fibers in typical processing methods.