硫化温度对Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+)红色长余辉材料的形貌和发光性质的影响

Influence of Sulfuretting Temperature on the Morphology and Luminescent Properties of Y_2O_2S:Eu^(3+),Mg^(2+),Ti^(4+) Red Long Afterglow Phosphors

用氢氧化钇纳米棒作为前驱体,与氧化铕、二氧化钛、碱式碳酸镁混合后,用碳粉和硫粉混合硫化合成Y2O2S:Eu3+,Mg2+,Ti 4+红色长余辉发光材料,研究硫化温度对Y2O2S:Eu3+,Mg2+,Ti 4+形貌和发光性质的影响。改变烧结温度分别制备得到零维、一维、三维的Y2O2S:Eu3+,Mg2+,Ti 4+长余辉材料。与三维粉体相比,零维和一维粉体的激发光谱向短波长移动,同时零维和一维粉体的余辉曲线衰减较快;热释光谱有两个峰,峰值分别在340K和490K附近,表明当烧结温度超过1 000℃,存在有两种不同类型的电子陷阱。

Using Y（OH）3 nanorods as precursor, Y2O2S： Eu3＋ , Mg2＋ , Ti4＋ red long-lasting phosphors were prepared via solid-state reaction, and the effect of sulfuretting temperature on the morphology and luminescent properties was discussed. Zero-, one-and three-dimensional Y2O2S： Eu3＋ , Mg2＋ ,Ti4＋ phosphors were prepared by changing sulfuretting temperature. Compared with three-dimensional phosphors, excitation peaks of zero-and one-dimensional phosphors shifted to the shorter wavelength. The decay speeds of the afterglow for zero-and one-dimensional phosphors were faster than that of three-dimensional Y2O2S：Eu3＋ ,Mg2＋ ,Ti4＋ phosphors. Two peaks of TL curves located at around 340 K and 490 K separately, indicated the existance of two kinds of trap types exist when the calcination temperature exceeded 1 000℃.