Multimode luminescence regulation of up-conversion perovskite resistant to corrosive gas toward high-performance luminescent fibers and intelligent sensing

Lead-free halide double perovskites have garnered extensive research attention due to their outstanding environmental protection performance, structural tunability, and excellent photoelectric properties. However, stable multimode luminescent perovskite materials and more extensive application research remain urgent problems to be solved. In this study, holmium-based lead-free double perovskite with good resistance to thermal quenching was successfully synthesized. The up-conversion luminescence (UCL) of perovskite can be regulated by doping Yb 3+ . Moreover, the emission wavelength can be effectively regulated by adjusting the doping concentration of Yb 3+ and the power of the excited laser. In addition, the aramid staple fiber (ACFs) and polyphenylene sulfide (PPS) composite fiber paper, after being modified with lead-free perovskite, exhibits luminescent properties under ultraviolet (UV) light and near-infrared (NIR) light. The modified luminescent fibers maintain their original flexibility and have good luminescent stability. After being stored in industrial acidic gases for 48 h, the luminescent fibers still maintained good luminescence performance, and no obvious luminescence quenching was observed. Surprisingly, the modified composite fibers also have good piezoelectric properties. The piezoelectric properties of perovskite piezoelectric fibers have been significantly improved through the doping of Yb 3+ . Its maximum output voltage is 17 V, and the response time is 9 ms. Perovskite-type piezoelectric fiber devices exhibit good output stability in humid environments. Multimode emission lead-free perovskite and its functional textiles will have strong competitiveness in the fields of flexible wearable fabrics and intelligent sensing and reality.