To alleviate the wastage of resources and environmental pollution caused by waste luminous polyester fibers, glycolysis was found rapidly to degrade luminescent polyester fibers and assist in recovering luminescent materials from the fibers. However, the luminescent performance of recycled luminescent materials is poor. To improve the performance of recovered luminescent materials, this study employs the recovery rate of luminescent materials, initial brightness, and recovery rate of Bis (2-hydroxyethyl) terephthalate as performance indexes. The present study aims at optimizing the alcoholysis process by influencing factors such as the amount of catalyst, amount of ethylene glycol added, and reaction temperature to improve the luminous performance, and explores the mechanism of alcoholysis reaction in the recovery process of luminescent materials. The results showed that, when the catalyst content is 0.1 g, the mass ratio of polyethylene terephthalate:ethylene glycol is 1:10, the reaction temperature is 170°C for 4 hours, the Bis (2-hydroxyethyl) terephthalate conversion rate reaches 61.92%, the recovery rate of luminescent materials reaches 92.53%, and the initial brightness is as high as 5.607 cd/m2.
In our previous study, it was found that Rhodamine B@SrAl2O4:Eu2+, Dy3+/ Sr2MgSi2O7:Eu2+, Dy3+ can achieve a red shift in luminescence color. In order to improve the stability of the luminous material and reduce the loss of red luminescence emission in subsequent application, the Rhodamine B@SrAl2O4:Eu2+, Dy3+/ Sr2MgSi2O7:Eu2+, Dy3+ was coated with SiO2, and SiO2/ RhB@SrAl2O4:Eu2+, Dy3+/Sr2MgSi2O7:Eu2+, Dy3+ was successfully synthesized by sol-gel method. The microstructure, surface structure, luminescence properties, afterglow properties, the coating effect, and stability of the sample were studied by changing the SiO2 coating ratio and temperature during the coating process. The results showed that when the proportion of SiO2 coating is 30% and the temperature is 60℃, the effect of SiO2 coating was best. As the proportion of SiO2 more than 30%, the absorption and release of light by the sample were greatly affected, and the afterglow performance decreased.
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