Microstructure and spectral characteristics of spectrum-fingerprint fiber with double luminous centers for anti-counterfeiting application.

Spectrum-fingerprint anti-counterfeiting fiber with double luminous centers was tentatively prepared using ${{\rm SrAl}_2}{{\rm O}_4}:{{\rm Eu}^{2 + }},{{\rm Dy}^{3 + }}$SrAlO:Eu,Dy, ${{\rm Sr}_2}{{\rm MgSi}_2}{{\rm O}_7}:{{\rm Eu}^{2 + }},{{\rm Dy}^{3 + }}$SrMgSiO:Eu,Dy, and PAN powder as main raw materials by wet spinning. The microstructure and spectral properties of the fiber were studied by means of scanning electron microscope (SEM), x-ray diffractometer (XRD), and a fluorescence spectrophotometer. The results showed that the two rare-Earth luminous materials were randomly dispersed on the interior and surface of the fiber. Due to the spinning process, the luminescent materials were agglomerated in fiber, and there were many voids in the fiber. Compared with pure rare-Earth luminous materials, the emission wavelength of the spectrum-fingerprint anti-counterfeiting fiber has no obvious shift, but the addition proportion and amount of two rare-Earth luminous materials have great influence on the spectral curve of the fiber. This fiber with two luminous centers maintains the basic characteristics of spectrum-fingerprint anti-counterfeiting fiber and is a new, to the best of our knowledge, type of anti-counterfeiting fiber with high anti-counterfeiting application potential.