Synthesis and characterization of Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+) nanorods via a solvothermal routine

摘要

Y2O2S:Eu3+,Mg2+,Ti4+ nanorods were prepared by a solvothermal procedure.Rod-like Y(OH)3 was firstly synthesized by hydrothermal method to serve as the precursor.Y2O2S:Eu3+,Mg2+,Ti4+ powders were obtained by calcinating the precursor at CS2 atmosphere.The Y2O2S:Eu3+,Mg2+,Ti4+ phosphor with diameters of 30-50 nm and lengths up to 200-400 nm inherited the rod-like shape from the precursor after calcined at CS2 atmosphere.The Y2O2S:Eu3+,Mg2+,Ti4+ nanorods showed hexagonal pure phase,good dispersion and exhibited bright red luminescence.After irradiation by 265 or 325 nm for 5 min,the phosphor emitted red long-lasting phosphorescence,and the phosphorescence could be seen with the naked eyes in the dark clearly for more than 1 h after the irradiation source was removed.It was considered that the long-lasting phosphorescence was due to the persistent energy transfer from the traps to the Ti4+ and Mg2+ ions to generate the red-emitting long-lasting phosphorescence.