Fabrication Of High-Efficient Luminescent Materials And Their Applications In Polymers

Long afterglow luminescent materials are a class of photoluminescence materials.As a kind of green light source materials,they have attracted greater attention due to the recent energy shortages.Since they consume their own energy,they do not need external energy supply,which makes the materials irreplaceable in certain specific environment.Hydrogels are made of natural or synthetic polymers with a three-dimensional cross-linked network structure.Under physiological conditions,hydrogels can store large amounts of water in their internal structure,similar to biological tissues,making hydrogels ideal condidates for biological tissues.Therefore,it is of great significance to develop a method of highly efficient and rapid fabrication of long afterglow materials and apply them to hydrogels.In this paper,a step for the rapid fabrication of Eu²⁺/Dy³⁺co-doped silicate long afterglow luminescent materials?SLALM?by microwave radiation method was employed.SLALM was modified by silane coupling agent?MPTS?,after which the surface modified long afterglow powders?MPTS-SLALM?were dispersed alongside acrylamide?AM?and hydroxyethylacrylate?HEA?into an aqueous solution to fabricate the hydrogel material with long afterglow properties?PAM-PHEA-S?via crosslinking copolymerization,where S denotes the surfaced-modified long afterglow powders,MPTS-SLALM.Furthermore,the effects of reaction conditions such as Eu²⁺and Dy³⁺contents,microwave reaction time,the content of the solvent?H₃BO₃?in SLALM on the long afterglow properties and the effects of different contents of MPTS-SLALM on the long afterglow luminescent hydrogel in fluorescence microscopic morphology,attenuation-and mechanical properties were studied.The results showed that the microwave radiation method is a simple,green economy and effective preparation of long afterglow materials,with which high homogeneity,excellent luminescent properties and water-resistant SLALM was successfully fabricated.The optimal composition of SLALM was Sr_1.975MgSi₂O₇:Eu²⁺_0.01.01 Dy³⁺_0.015,while the amount of H₃BO₃was 5wt%at microwave sintering timing of 30min.In addition,the surface modification of MPTS was justified through characterization analysis,which showed increased dispersion of SLALM without any effect on its luminescent properties.The fluorescence microscopic analysis depicted that the dispersion of MPTS-SLALM within the hydrogel was very good,without any cluster phenomenon.The PAM-PHEA-S hydrogels maintained good water absorption properties,high mechanical strength,and better thermal stability,in addition to demonstrating unique long afterglow luminescent properties,thereby making the as-fabricated multifunctional hydrogels have potential application values in the field of medicals and biological materials.