Study On Doping Vario-property Of Y₂O₂S-based One-dimensional Nanotube Red Long-lasting Phosphors

Recently, low-dimensional long-lasting phosphor materials have attracted great attention because their luminescence properties can be greatly affected by the dimensions and morphology, and such phosphor materials have been widely applied in optical, electronic, biochemical, and medical devices. In a variety of preparation methods of nanomaterials, the hydrothermal method which exhibits some advantages of low processing temperature, high homogeneity, and better crystal shape has become a promising method for the synthesis of well-crystallized nanomaterials.In this paper, red long-lasting phosphor Y2O2S:EU3+1, Mg2+, Ti4+nanotubes were prepared by a new hydrothermal method that all cations were mixed uniformly before hydrothermal process. Effects of simultaneous change of Mg2+and Ti4+contents, different divalent alkaline-earth metal ions and quadrivalent ions on the crystal characteristics, morphology, luminescent properties and afterglow performance of phosphors were studied. Meanwhile, Y2O2S:Eu3+,Zn2+,Ti4+nanotubes were prepared, its crystal structure, morphology, luminescent property and afterglow performance were discussed carefully. The detailed conclusions were summarized,(1) Y2O2S:Eu3+, Mg2+, Ti4+nanotubes with different contents of (Mg2+, Ti4+) multiple-ion dopant were prepared through the hydrothermal method. The result showed that the sample doped with3.0%Mg2+and3.0%Ti4+, the luminescence performance of sample was the best, the initial brightness was960mcd/m2and the afterglow time could last for over450s (>1mcd/m2).(2) Y2O2S:Eu3+, M2+(M=Mg, Ca, Sr, Ba), Ti4+nanotubes with different divalent alkaline-earth metal ions were prepared in the similar way as (1). The result showed that the afterglow property of phosphors doped with different divalent alkaline-earth metal ions decreased according to the order of Mg2+, Sr2+, Ca2+, Ba2+. For the sample doped with Mg2+, the initial brightness was1150mcd/m2and the afterglow time could last for over1065s (≥1mcd/m2).(3) Y2O2S:Eu3+, Mg2+, Z4+(Z=Ti, Si, Nb, Zr) nanotubes with different quadrivalent ions were prepared in the similar way as (1). The result showed that the afterglow property of phosphors doped with different quadrivalent ions decreased according to the order of Ti4+, Nb4+, Zr4+, Si4+. For the sample doped with Ti4+, the initial brightness was1068mcd/m2and the afterglow time could last for over1010s (≥1mcd/m2).(4) Y2O2S:Eu3+, Zn2+, Ti4+nanotubes were prepared. The result showed that the sample was composed of pure Y2O2S phase and tube-like structure. Under325nm UV excitation, the emission spectra indicated the strongest red emission line at627nm, which corresponded to the transition from5Do to7F2level of Eu3+ion. Both the afterglow decay curve and TL curve revealed that the phosphor had efficient luminescent and excellent long-lasting property.