Warm-toned SiO2/red-emitting color converter@SrAl2O4:Eu2+, Dy3+ luminous fibers with variable and color-tuned luminescence on the basis of radiative energy transfer and color conversion

Abstract

Considerable potential application stimulates the exploration of new ways to prepare warm-toned multicolor luminous fibers. However, most of the previous attempts failed. Radiative energy transfer (RET) and color conversion enable the preparation of multicolor luminous fibers with warm-toned luminescence. In this work, a series of warm-toned luminous fibers with variable and color-tuned luminescence was obtained using SiO2/red-emitting coumarin color converter (RECC)@SrAl2O4:Eu2+, Dy3+ (SAOED) long-lasting phosphorescent composites as the luminescence materials on the basis of the RET and color conversion from SAOED to RECC. The surface and cross morphologies, phase structure, photoluminescence emission spectra, CIE-1931 chromaticity coordinates, luminescence images, and afterglow properties of the luminous fibers were characterized. Results showed that the luminescent color of the luminous fibers can turn from yellowish-green to red by adjusting the RECC concentration used to prepare SiO2/RECC@SAOED and shifted toward red gradually in darkness with the decay of luminescence. The afterglow lifetime of the luminous fibers can sustain up to 7719 s when the RECC concentration was 0.2%. The luminescence mechanism of the luminous fibers was also discussed. The results will be substantially beneficial for multicolor luminous fiber preparation.