Conclusions
(1) The phase composition of the SMSED-PP lumi- nescent fibers prepared by melt-spinning method was an independent stack of that of SMSED and polypropylene matrix, which ensured that the SMSED-PP fibers might have both the spectral characteristics of SMSED and the physicochemical properties of polypropylene fibers, as well as proved the feasibility of preparing the SMSED- PP luminous fiber by high temperature melt-spinning method. (2) The range of the excitation wavelength of SMSED- PP fiber was 250–450 nm, belonging to the category of ultraviolet rays and visible light, ensuring that the day- light and fluorescent lamps, etc., could be used as the ex- citation source of this fiber; the emission peak was lo- cated at about 460 nm, belonging to the typical blue lu- minescence, and originating from 5d-4f transition of Eu2+ ions in the SMSED host lattice. (3) When the content of SMSED phosphors was 15 wt.%, the SMSED-PP fiber had good spinnability, me- chanical properties and afterglow intensity with its initial afterglow brightness up to more than 0.8 cd/m2. (4) Afterglow life of SMSED-PP luminous fiber was approximately 7 h, whose afterglow decay process con- sisted of fast and slow decay phases, and whose charac- teristics mainly depended on the depth and concentration of trap levels in the long afterglow luminescent material.
Conclusions (1) The phase composition of the SMSED-PP lumi- nescent fibers prepared by melt-spinning method was an independent stack of that of SMSED and polypropylene matrix, which ensured that the SMSED-PP fibers might have both the spectral characteristics of SMSED and the physicochemical properties of polypropylene fibers, as well as proved the feasibility of preparing the SMSED- PP luminous fiber by high temperature melt-spinning method. (2) The range of the excitation wavelength of SMSED- PP fiber was 250–450 nm, belonging to the category of ultraviolet rays and visible light, ensuring that the day- light and fluorescent lamps, etc., could be used as the ex- citation source of this fiber; the emission peak was lo- cated at about 460 nm, belonging to the typical blue lu- minescence, and originating from 5d-4f transition of Eu2+ ions in the SMSED host lattice. (3) When the content of SMSED phosphors was 15 wt.%, the SMSED-PP fiber had good spinnability, me- chanical properties and afterglow intensity with its initial afterglow brightness up to more than 0.8 cd/m2. (4) Afterglow life of SMSED-PP luminous fiber was approximately 7 h, whose afterglow decay process con- sisted of fast and slow decay phases, and whose charac- teristics mainly depended on the depth and concentration of trap levels in the long afterglow luminescent material.
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