Preparation and luminescence performance of thermochromic luminescent fiber based on reversible thermochromic red pigment

• Published in: Journal of materials science. Materials in electronics 2021-04, Vol.32 (7), p.9074-9086
• Main Authors: Shi, Muyang, Li, Xiaoqiang, Zhu, Yanan, Pang, Zengyuan, Jin, Yang, Ge, Mingqiao
• Format: Article
• Language: English
• Subjects: Absorptivity; Ambient temperature; Cellulose acetate; Characterization and Evaluation of Materials; Chemistry and Materials Science; Diameters; Differential scanning calorimetry; Dimethylformamide; Earth; Electron microscopes; Emission analysis; Emission spectra; Europium; Fluorescence; Luminescence; Materials Science; Optical and Electronic Materials; Optical properties; Red pigments; Smart materials; Spinning (materials); Thermal stability; Wet spinning
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-05576-4

SrAl 2 O 4 : Eu 2+ , Dy 3+ (SAOED) and Y 2 O 2 S: Eu 3+ , Mg 2+ , Ti 4+ (YOS), as two kinds of important rare earth luminescent materials, are widely used in fibers due to their excellent luminescent properties. However, the lack of sensing property limits the application areas of the fibers in intelligent materials. In this work, the thermochromic luminescent fiber (TLF) was prepared by wet spinning from the cellulose acetate (CA)/dimethyl formamide (DMF) spinning solution. The rare earth luminescent materials serviced as the luminescent sources and thermochromic pigments (TP) acted as the thermochromic agent in this color changing system. The absorptivity curves and fluorescence spectra were recorded at 25 and 45 °C to investigate the thermosensitive characteristics of the fiber. The scanning electron microscope (SEM) observation presents that the TLFs were cylindrical with the diameters of 300–400 µm and three kinds of particles were evenly distributed in the cellulose matrix. X-ray diffraction (XRD) results confirm that cellulose matrix and the wet spinning process did not destroy the phase of rare earth luminescent materials in the fiber. Thermal stability of TLF was illustrated by differential scanning calorimetry (DSC) and thermal gravity analysis (TGA). Absorptivity and emission spectra measurement indicates that the TLF had perspicuous thermochromic luminescence properties. Decay curves showed that the TLF glowed continuously. This work exploits a new type of intelligent luminescent fiber that can respond to ambient temperature, which broadens its application in sensors.