The optical properties of afterglow nanoparticles were successfully improved by the addition of polyethylene glycol (PEG) to an\r\nafterglow colloidal solution. Afterglow nanoparticlesââ?¬â?Sr2MgSi2O7: Eu2+, Dy3+ââ?¬â?were prepared by laser ablation in liquid. The\r\nquantum yields and the decay curves were measured by a fluorescence spectrophotometer. An increase in the amount of PEG\r\nadded to the solution increased the quantum yield of the nanoparticles and improved the afterglow property in the initial portion\r\nof the decay curve. However, the afterglow property did not change after a substantial amount of time had passed. The afterglow\r\nnanoparticles were capped with PEG molecules, and surface defects of the nanoparticles were passivated, which decreased the\r\noptical properties.
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