A Heat-Stimulated Luminous Fiber Using Heat-Sensitive Green TF-G Pigment

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.

Soft, Stretchable, and Pneumatically Triggered Thermochromic Optical Filters with Embedded Phosphorescence

“…Although Joule heating can trigger color change in thermochromic species, there are fewer examples in which heat directly triggers luminescence. Light can be generated using heat-sensitive luminescent ions or heat-induced phase change between a nonluminescent and luminescent crystal. − However, heat-activated luminescence generally requires complex chemistries and specialized processes.…”