Preparation of SMSED-PP luminescent fiber The SMSED-PP luminescent fibers were prepared by the melt-spinning process. The fiber-forming PP chips, SMSED phosphors and spinning additives were mixed thoroughly in scheduled proportion by a high-speed mixer. The mixture was extruded in a twin-screw master batch producer at 250–270 °C to get luminescent master batches for the spinning application. Then, the lumines- cent master batches were mixed with scheduled weights of PP chips, the mixture were melted and spun to obtain the SMSED-PP luminescent fiber at a spinning tempera- ture of 250 °C, spinning speed of 2000 m/min and draw ratio of 3. According to the above spinning process, four series of SMSED-PP fiber samples with SMSED phosphors con- tent of 5 wt.%, 10 wt.%, 15 wt.% and 20 wt.%, respec- tively, were prepared. Four series of SMSED-PP fiber samples contain the same dosage of spinning additives, i.e., titanate coupling agent of 0.02 wt.%, octadecana- mide of 0.03 wt.% and PE-WAX of 0.1 wt.%.