Preparation of High-Luminescent Materials and Application of Luminescent Coatings in Road Engineering

Abstract

With the development of the highway industry and new materials, long-afterglow luminescent material as a new energy storage and environmental protection material has gradually been applied to night lighting. In this study, SrAl2O4:Eu2+, Dy3+ long-afterglow materials were prepared by the solid-state reaction method. The luminescent properties were improved by changing the process parameters. The single-factor test results indicated that the luminescent properties were highest when flux content, calcination temperature, calcination time, and doping ratio of Eu and Dy were 5%, 1,300°C, 2 h and 1∶1, respectively. Then, long-afterglow materials with high luminescence were prepared by adding a pore-forming agent. The structural characteristics and optical properties of the products were analyzed. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the addition of pore-forming agent did not change the crystal structure of the material but changed the surface morphology of the long-afterglow materials. The surface morphology of the products changed from flat and dense to a convex structure after adding pore-forming agent, and some connected pore structures were produced. The afterglow performance of products was continuously improved with the increase of pore-forming agent content. Finally, luminescent coatings were prepared by combining with fluorine-containing resin, and the performance was studied. The stability of luminescent coatings decreased with the increase of the filler:binder ratio, and the best ratio was 0.5∶1. The luminous performance of coatings was best when the amount of long-afterglow phosphor was 40%. The luminescent coatings had good adhesion with the road surface, and the luminescence could last for more than 7 h in a dark environment.