Abstract
In this study, we fabricated a heat-stimulated luminous fiber (HSLF) by wet spinning. The HSLF consists of Sr2ZnSi2O7: Eu2+, Dy3+ (SZSO), Y2O2S: Eu3+, Mg2+, Ti4+ (YOS), and heat-sensitive green TF-G pigment (HSGP). SZSO and YOS serve as a source of luminescence to yield a long afterglow system. HSGP is a heat-stimulating agent which develops the link between luminescence and temperature for HSLF. The luminescence of the HSLF is dull below 30 °C, but vivid above 30 °C. The luminescence of HSLFs can be stimulated by low heat (human body temperature). Emission spectra were recorded at 20 °C and 30 °C to investigate the heat-stimulated luminescent performance of HSLFs. HSLF is a smart material which can discern the exciting light to change color because of the photo-thermal effect. This characteristic provides optimum conditions for SZSO and YOS to store energy. The results demonstrated that most luminescence from SZSO and YOS could be absorbed by HSGP at 20 °C, but the luminescence could be liberated at 30 °C. The heat-stimulated phenomenon could also be verified by afterglow and the naked eye.
Highlights
In recent years, many researchers have focused on luminous fibers, which show practical applications in apparel, wearable devices, safety warning systems, and decorations
X-ray diffraction (XRD) results demonstrated that milling did not destroy the crystal crystal structure of the rare-earth materials, which using were aprepared using a structure of the rare-earth luminescentluminescent materials, which were prepared high-temperature high-temperature solid-state method
The crystal structures of SZSO, YOS, and heat-sensitive green TF-G pigment (HSGP) were not disturbed were not disturbed spinning; properties of the rare-earth materials and by spinning;,by the properties of thethe rare-earth luminescent materialsluminescent and HSGP were retained retained in the fiber
Summary
Many researchers have focused on luminous fibers, which show practical applications in apparel, wearable devices, safety warning systems, and decorations. There are several long-afterglow rare-earth luminescent materials that can be used to prepare luminous fibers, such as Sr2 ZnSi2 O7 : Eu2+ , Dy3+ (SZSO), Sr2 AlO3 : Eu2+ , Dy3+ (SAO), Y2 O2 S: Eu3+ , Mg2+ , and Ti4+ (YOS). Namely fluorane dye as the color former, weak acids as the developer, and alcohols as the co-solvent, can be mixed to form a reversible thermochromic system This reversible thermochromic system is driven by interactions among the three components. SuchSuch a reversible thermochromic system can andthe the system acquires natural color of fluorane a reversible thermochromic system becan encapsulated in a polymer envelope to form a microcapsule as a pigment [16,17,18,19,20].
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