In this study, down-conversion fluorescent powder of Sr2ZnSi2O7:Eu2+,Dy3+, SrAl2O4:Eu2+,Dy3+ and Y2O2S:Eu3+,Mg2+,Ti4+, which were the common three primary colors materials with long afterglow, were synthesized by high temperature solid state method. The blends of rare earth (RE) luminescent materials have been of interest to reinvest the luminescent characteristics of polyethylene terephtahalate (PET) luminous fiber. The scanning electron microscopy (SEM) and an inversion fluorescence microscope were used to characterize the surface morphology and the dispersion of inclusion. Through analysis of microcosmic morphology, three typical dispersions of luminescent particles were summarized. The X-ray diffraction indicated that the phase structure of fiber samples and crystal structure of luminescence materials kept complete after prilling and spinning. From the fluorescence spectra and CIE 1931 co-ordinates, it could be found that different combinations of luminous fibers were desired to obtain divers colors emission luminous fi-ber. And the fiber samples were a light sensation which could induct different excitation wavelengths and convert it down to different colors. The afterglow decay curve and its differential curve were summarized indicating the three decay stages. The decay curve and decay rate curve showed that the contents of Sr2ZnSi2O7:Eu2+,Dy3+, SrAl2O4:Eu2+,Dy3+ and Y2O2S:Eu3+,Mg2+,Ti4+ had obvious in-fluence on the afterglow of fiber samples.
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