钨酸盐发光材料的制备及发光性质研究

发布时间：2018-05-22 17:46

  本文选题：钨酸盐 + 溶剂热　； 参考：《大连海事大学》2017年硕士论文

【摘要】：近年来,稀土掺杂上转换发光材料成为了各国的研究热点。其中钨酸盐就是一种良好的基质材料,具有稳定的物理化学性质,在很多应用场合具有不可替代的优势。钨酸盐作为一种优秀的发光材料,已经在各个领域已得到了非常广泛的应用。因此,本文研究了稀土掺杂钨酸盐发光材料上转换发光,主要内容以及研究成果如下:1.采用固相法制备了 Er~(3+)掺杂以及Yb~(3+),Er~(3+)共掺的NaY(WO_4)_2荧光粉,并且用X射线衍射和光谱分析表征了制备的发光粉样品。在980nm激发下,NaY(WO_4)_2:Yb~(3+),Er~(3+)样品呈现明亮的绿色上转换发光,随着Yb~(3+)离子掺杂浓度的增加,并没有提高其光谱中的红光发射成分,具有极好的色纯度和颜色稳定性,其绿色上转换成分非常强。在1550 nm激发下样品也呈明亮的绿色发光,其上转换光谱中的红光成分比980 nm激发要高。2.同样采用固相法制备了NaY(WO_4)_2:Tm~(3+),Er~(3+)共掺的荧光粉,且用X射线衍射和光谱分析表征了制备的发光粉样品。在980 nm激发下样品呈现绿色上转换发光,样品的红绿比值随着激发功率的增加而逐渐减小。其发光颜色从白光区域直接移动到了绿色区域,且变化范围较大。在1550nm激发下呈现红色上转换发光,表现出很强的红光和红外光发射,随着激发功率的增加,样品的红绿分值比呈现先增加后减小的趋势。3.采用溶剂热法制备了 NaLa(WO_4)_2:Yb~(3+),Er~(3+)上转换发光材料。通过该改变溶液的pH、乙二醇和水的比例、温度、以及络合剂的量对样品的形貌和上转换发光性质进行了分析。在低温120 ℃成功合成样品,且形貌规则,PVP的掺入使得样品得到了进一步的分散,掺杂0.3 g时分散程度最佳。乙二醇和水的比例为4:1时,样品呈现规则的球状结构,颗粒最小,当溶液pH达到10,样品发光最强。在980 nm激发下,样品的发光强度相对较强,色稳定性好,Er~(3+)的最佳掺杂浓度为2 mol%,Yb~(3+)的最佳掺杂浓度为8 mol%。在1550 nm激发下,样品的发光强度相对较弱,Er~(3+)的最佳掺杂浓度为8 mol%,Yb~(3+)的最佳掺杂浓度为16 mol%。
[Abstract]:In recent years, rare-earth doped up-conversion luminescent materials have become the focus of research all over the world. Among them tungstate is a good matrix material with stable physical and chemical properties and has irreplaceable advantages in many applications. Tungstate, as an excellent luminescent material, has been widely used in various fields. Therefore, the upconversion luminescence of rare earth doped tungstate luminescent materials has been studied. The main contents and results are as follows: 1. NaY(WO_4)_2 phosphors doped with Er~(3) and co-doped with Yb~(3 were prepared by solid phase method. The samples were characterized by X-ray diffraction and spectroscopic analysis. Under the excitation of 980nm, the sample of NaYWO _ 4 / C _ 2: Yb _ 2O _ 3 / C ~ (2 +) shows bright green up-conversion luminescence. With the increase of the concentration of Yb~(3), the red emission component in the spectrum has not been improved, and it has excellent color purity and color stability. Its green upconversion component is very strong. The samples also exhibit bright green luminescence under excitation at 1550 nm. The red component in the upconversion spectra is higher than that in the 980nm excitation. The phosphors co-doped with NaY(WO_4)_2:Tm~(3 were also prepared by solid phase method. The samples were characterized by X-ray diffraction and spectroscopic analysis. The sample exhibits green up-conversion luminescence at 980 nm, and the ratio of red to green decreases with the increase of excitation power. Its luminous color moves directly from the white light region to the green area, and the range of variation is large. Under the excitation of 1550nm, red upconversion luminescence was observed, showing strong infrared and infrared emission. With the increase of excitation power, the red and green scores of the samples increased first and then decreased. The upconversion luminescent material of NaLa(WO_4)_2:Yb~(3 _ (+) er ~ (2 +) was prepared by solvothermal method. The morphology and up-conversion luminescence properties of the samples were analyzed by changing the pH of the solution, the ratio of ethylene glycol to water, the temperature and the amount of complexing agent. The samples were successfully synthesized at 120 鈩，

本文编号：1923032