不同基质结构对长余辉发光材料发光光谱的影响

在研究不同配比的发光粉基质材料铝酸锶的基础上 ,对Sr0 .95Eu0 .0 2 5Dy0 .0 2 5O·Al2 0 3 和 4(Sr0 .95Eu0 .0 2 5Dy0 .0 2 5O)·7Al2 O3 进行发射光谱的测试和SEM分析 ,得出Eu2 + 处在不同晶格结构中发射光谱不同的结论 .     

微波辐射合成Y2SiO5RE（Ⅲ）荧光体及发光性能

用微波辐射法合成硅酸钇基质掺稀土系列６种荧光体，用Ｘ－射线粉末衍射测定其相组成，并测定了荧光体的激发光谱和发射光谱．在２５４ｎｍ光激发下，测定其色坐标．研究了激活剂浓度对发光强度的影响．     

KSrGd(PO_4)_2︰Eu~(2+),Mn~(2+)红色荧光粉的合成和发光性能

采用改进的高温固相法合成了Eu2+/Mn2+掺杂的KSrGd(PO4)2荧光粉.用X射线粉晶衍射仪和荧光光谱仪对样品进行了表征.结果表明:Eu2+离子和Mn2+离子成功掺入了KSrGd(PO4)2晶格中,基质晶体结构未见明显变化.Eu2+的发射峰位于522 nm,Mn2+的发射峰位于618 nm.通过Eu2+和Mn2+之间的能量传递,KSrGd(PO4)2荧光粉在紫外光激发下发出明亮的红光.     

HRT对SUFR系统处理效果的试验分析

分析了总水力停留时间(11 h、9 h、 8 h、 6 h)对螺旋升流式反应器系统处理效果的影响.利用SUFR系统进行试验研究的结果表明,在HRT大于8 h(厌氧停留时间1.51 h,缺氧停留时间2.25 h,好氧停留时间4.24 h)时,该系统COD、TN、TP的处理效果随着水力停留时间的减小变化不大,COD、TN、TP去除率仍分别达到93%﹑87%、90.2%以上.当HRT降为6 h(厌氧停留时间1.13 h,缺氧停留时间1.69 h,好氧停留时间3.18 h)时,处理效果变化较大,但COD的去除率仍高于85%,TN、TP的去除率变为76%、72%,仍具有较高的去除率.这说明,接近活塞流特征的SUFR系统可以减轻增加水力负荷对污水处理的负影响,具有较强的抗冲击负荷能力.     

Synthesis and characterization of red-emitting Yb/Ho-CaSiO3 upconversion phosphors

Host material plays an important role in obtaining efficient photon upconversion and downshifting luminescence. Generally, fluoride and oxyfluoride glasses-based materials are used for high-efficiency photon upconversion. However, the poor thermal stability of fluoride glasses and the toxicity of fluorine ions limit their applications. In this report, Yb/Ho-doped CaSiO₃ wollastonite phosphors have been demonstrated as efficient red-emitting upconversion phosphors. The phosphors have been synthesized by microwave hydrothermal process followed by heat treatment at 1050 ?°C in the air environment. 2M phase of the β-wollastonite has been confirmed by X-ray diffraction and Raman spectroscopy while the existence of the Yb and Ho dopants in the CaSiO₃ lattice has been confirmed by X-ray photoelectron spectroscopy. The synthesized samples showed strong red upconversion emission centered at 662 ?nm and near-infrared downshifting emissions at 2016 ?nm upon 980 ?nm excitation. The emissions were found to depend significantly on the Ho concentration. Temporal evolution of the main emission bands was investigated to show that the energy transfer upconversion from Yb to Ho ions was responsible for the efficient upconversion and downshifting phenomenon.