摘 要:该文主要采用了化学液相共沉淀法合成了一系列的镨、铽共掺杂的钼酸钙的发光材料,并研究了单掺Pr3+和单掺Tb3+以及CaMoO4:0.03Pr3+,yTb3+共掺杂的浓度以及温度对材料发光性能的影响。采用X射线衍射仪(XRD)对发光粉体进行了晶格结构的表征,采用荧光光度计对样品的发射光谱和激发光谱进行表征。结果表明,Pr3+、Tb3+的最佳掺入量均为3%。CaMoO4:0.03Pr3+的最佳煅烧温度为800℃,CaMoO4:0.05Tb3+的最佳煅烧温度为600℃。随着Pr3+、Tb3+掺入量的增加,CaMoO4:Pr3+发光材料的特征发射光谱和激发光谱的特征峰时一直减小的,而CaMoO4:Tb3+发光材料是先减小后增大的,存在着浓度猝灭效应。此外,在CaMoO4:0.03Pr3+,yTb3+发光体系中,Tb3+离子的共掺杂可显著增强镨离子的特征发射峰,这是由于存在Tb3+→Pr3+的有效的能量传递。32934
毕业论文关键词:钼酸钙;镨、铽共掺杂;共沉淀法;发光性能;稀土
Luminescence Investigation of Pr3+-Tb3+ Co-doped CaMoO4 Phosphor
Abstract:In this paper,A series of Pr3+-Tb3+ co-doped CaMoO4 nano-structured materials were prepared by chemistry liquid co-precipitation method.And discussed the Pr3+ and Tb3+ and CaMoO4:0.03Pr3+,yTb3+concentration and temperature on the luminescent properties of materials.The crystal structures and spectrum characteristics of the obtained samples were identified by X-ray powder diffraction (XRD)and spectrophoto-fluorometer.The photo luminescence property was investigated.The results showed that the optimum concentrations of both were 3% and the optimum calcination temperatures of CaMoO4:0.03Pr3+ were 800℃and CaMoO4:0.05Tb3+ were 600℃.The intensity of excitation spectra and emission spectra of CaMoO4:Pr3+ Phosphors decrease and CaMoO4:Tb3+ phosphors firstly increase and then decrease because of concentration quenching effect with increasing Pr3+ and Tb3+ concentration.In addition,The luminescence properties of Pr3+ ion in CaMoO4:0.03Pr3+,yTb3+ system could be evidently improved by co-doping of Tb3+ ions.Which was due to the efficient energy transfer process from Tb3+ to Pr3+ ions.
Key Words:Calcium molybdate;Europium、Terbium co-doped;Co-precipitation method;Luminescence properties;Rare earths
目录
摘 要 1
引 言 2
1 实验部分 3
1.1 实验试剂及仪器 3
1.2 样品的制备 3
1.3 样品的测量 5
2 结果与讨论 5
2.1 XRD检测 5
2.2 红外光谱检测 6
2.3 CaMoO4:xPr3+材料的发光性质 7
2.4 CaMoO4:yTb3+材料的发光性质 9
2.5 CaMoO4:0.03Pr3+ ,yTb3+材料的发光性质 12
3 结 论 13
参考文献 13
致 谢 15
钐掺杂的硼酸锶发光材料的合成与光学性质
引 言
近些年来,随着科学技术的快速发展,人们对能源问题的认识也在更近一步的加深,寻找节能,清洁,环保的材料来替代能耗量大,污染严重的传统材料已经成为各个领域致力研究的重大任务。而稀土荧光材料的研究领域也随之逐渐扩大。自1993年发射蓝光的GaN发光二极管的出现和在1997[1–4]蓝色LED芯片第一次与商业LED结合得到黄色(Y,Ga)3(Al,Ga)5O12:Ce3+的荧光粉,白光发光二极管[5](LED)的巨大的阻碍,即所谓的下一代的固态光源,已经得到了很好的解决。白光LED作为最重要的固态光源,由于其使用效率比较高,耗电量小,发热量低,反应速度快,寿命也比较长,且环境友好型等一系列的特点[6,7],很有可能取代白炽灯和荧光灯。然而,上述方法获得的白光也有一些缺点,比如较低的显色指数和发光效率。结合红,绿和蓝与紫外或蓝色LED芯片被认为是实现白光LED荧光粉发光的最有前途的方法。然而,传统的红色荧光粉的化学稳定性和寿命[例如(Ca,Sr)S:Eu2+]并不是很出众,所以新型的荧光粉体很有必要的。因此,研究开发LED用高效显色荧光粉显得尤为重要[1,3,4]。钼酸盐基质三基色荧光粉由于具有烧结温度低,性质稳定,显色性高,热稳定性好,光色及色温可调,光色均匀且不随电流变化等优点而受到了广泛关注。因此钼酸盐荧光粉被认为是一种非常有前途的荧光粉材料。 钐掺杂的硼酸锶发光材料的合成与光学性质:http://www.youerw.com/huaxue/lunwen_29734.html