Study On Preparation And Doping Vario-property Of Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺Red Long Afterglow Nanoarrays

Y2O2S:Eu3+, Mg2+, Ti4+red long-lasting phosphors wher/2S, Eu3+Mg+and Ti4+act as host, activator, hole and electron tr ectively, can release the energy in the form of visible light aft moving the external excitation source. It is a promising red long afterglow luminescent material because of good performance and high chemical stability. In recent years, Y2O2S: Eu3+, Mg2+, Ti4+red long-lasting phosphor has attracted considerable attention since it has potential applications in various fields. More and more people focused on the study of red long afterglow Y2O2S:Eu3+, Mg2+, Ti4+nanoarrays prepared by sol-gel template method because of the advantageous of orderly arranged array, uniform and adjustable diameter size. However, the luminescent performance of the Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays is too poor to be applied. To optimize its luminescent performance, the effects of Eu3+doping concentration and different divalent metal ions on luminescence properties of the Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays are also discussed systematically.The Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays with different Eu3+Mg2+, Ti4+concentration and different divalent metal ions were prepared via sol-gel template method. The morphology, phase, spectral, afterglow properties of final products were characterized by SEM, XRD, fluorescence spectrophotometer, luminance meter. The results can be summarized as follow:(1) The Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays with different Eu3+doping concentration have been synthesized by sol-gel template method. The strongest red-emission peak is located at626nm under the339nm UV irradiation. The sample with Eu3+doping concentration at6.5mol%has the optimal emission intensity and afterglow time, which are2012mcd/m2and285s (>1mcd/m2), respectively.(2) The Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays with different Mg2+, Ti4+co-doping concentration have been synthesized by sol-gel template method. The strongest red-emission lies at626nm under the324nm UV irradiation. The sample with Mg2+, Ti4+doped molar ratio at2.5mol%has the optimal initial intensity and afterglow time, which are2120mcd/m2and695s(≥1mcd/m), respectively.(3) The Y2O2S:Eu3+, Mg2+, Ti4+red long afterglow nanoarrays phosphors with different divalent metal ions have synthesized by sol-gel template method. The experiments show that the afterglow performance of the sample by the order(Mg2+, Sr2+, Ca2+, Ba2+) decreasing. The sample with the divalent metal ion of Mg2+has the optimal initial intensity and afterglow time, which are2120mcd/m2and695s (≥1mcd/m2), respectively.