PEG coated nano-phosphor GdPO4•H·H2O:12%Eu3+ and its performance analysis

The surface modification and performance analysis of the nano-phosphor GdPO4·H2O:12%Eu3+ were carried out in this study. Since the rare earth phosphate is hydrophobic, its applications in the fields of biology and medicine are greatly restricted. In order to solve this problem, the microwave method was adopted for surface modification with PEG as the modifier in this paper, and the nano-phosphor GdPO4·H2O:12%Eu3+@PEG with excellent performance and a core-shell structure was prepared. XRD, SEM, TEM, FTIR, TG-DSC, FL and VSM were used to characterize the structure, morphology, optical and magnetic properties of the phosphor before and after modification. The results show that the nano-phosphor GdPO4·H2O:12%Eu3+ and GdPO4·H2O:12%Eu3+@PEG had the same structure, that is, a single hexagonal crystal structure. The morphology of the products before and after PEG coating was short rod; the agglomeration phenomenon was weakened after coating; and the thickness of the coating layer was about 10 nm. The positions of the excitation and emission peaks before and after coating did not move, but the fluorescence intensity increased by about 2–3 times; and the fluorescence lifetime increased by 0.2–0.3 ms. When the coating amount of PEG was 0.3000 g, the fluorescence intensity of GdPO4·H2O:12%Eu3+ was the highest. The color coordinates were basically the same before and after coating. The magnetic properties were basically unchanged, and the magnetization intensity was all 1.75 emu/g. The hydrophilicity and biocompatibility of the nano-phosphor GdPO4·H2O:12%Eu3+ were successfully solved in this paper, its luminescent properties were improved, and its magnetic properties were maintained.