▎ 摘　　要

Mono-disperse polystyrene (PS) microspheres with different particle sizes were synthesized by soap-free emulsion polymerization, and deposited for the first time by electrophoretic deposition on the surface of the self-made graphene fibers prepared by wet spinning, and photonic crystal fibers with different structural colors were finally obtained, and characterized by SEM, optical microscopy, UV reflection spectra and colorimetric analysis. The results showed that the three PS microspheres, with diameters of 198, 233 and 287 nm, respectively, were of smooth surface and uniform particle size with monodispersion coefficient less than 5%. After electrophoretic deposition, they were orderly aligned on the surface of graphene fibers as hexagonal close packing with a core-shell structure, forming photonic crystal fibers with different colors including blue, green and purplish red. Moreover, the photonic bandgaps of the three photonic crystal fibers were located at 471, 547, 670 and 398 nm, respectively, consistent with their colors. Calculated with Bragg's law, the reflection peaks of the photonic crystal fibers made from PS microspheres with 198 and 233 nm located at 474 and 558 nm, respectively, which are close to their experimental results. While the reflection peak of the photonic crystal fiber made from PS microspheres of 287 nm size was found at 687 nm, close to the longer wave peak of the experimental results. The CIE xyY color space was used to identify the color of the photonic crystal fibers. It was found that the brightness factors of blue, green, and purplish red photonic crystal fibers were 15.96, 29.72 and 3.85, respectively, which corresponded to 44%, 63% and 32% of pure blue, green and purple lightness, indicating that they all were of high brightness. Furthermore, the calculated saturation values of the blue, green, purplish red photonic crystal fibers were 63%, 59% and 60%, respectively, showing that they all had a high degree of saturation. The photonic crystal fibers do not need dyeing and their colors never fade, which meet the requirements of green and environmental protection, presenting broad prospect for their applications.