掺杂磷酸钆纳米材料的超声法合成与性质研究

发布时间：2018-01-26 00:29

  本文关键词： 磷酸钆 超声法 纳米材料 发光性能　出处：《贵州大学》2015年硕士论文　论文类型：学位论文

【摘要】：稀土纳米发光材料因稀土离子具有独特的电子结构和跃迁模式而表现出许多优异的性能,已被广泛应用于光电子器件、信息显示、人类医疗健康等领域。稀土纳米发光材料作为新一代的发光材料,成为了国内外的热点研究课题之一。超声法因具有操作简单及能在短时间、低温下合成纯度高、粒度细、分布均匀的材料等优点,开始受到了关注。本论文采用超声法合成了以磷酸钆为基质掺杂铕和铽的纳米发光材料,通过XRD、SEM、IR及PL等测试方法对样品的晶型、形貌及发光性能进行了表征与分析,主要探讨了掺杂离子浓度、溶液pH值、煅烧温度、加入配合剂柠檬酸和甘氨酸等因素对其形貌、晶型及发光性能的影响,也进一步探究了其结构、形貌与性能之间的相互关系。主要内容包括:1、采用超声法合成的GdPO4:Eu纳米发光材料,在pH=2时样品为纳米棒状结构,样品的结晶度很好,而在pH=10时样品为类似球状的纳米颗粒,且结晶度较低。pH值为10时的发光强度比pH值为2时的发光强度大。经过高温煅烧后的样品,失去结晶水,由六方晶系变成单斜晶系,并且发光强度增加,在1000℃煅烧下的样品的发光强度大于800℃下煅烧的样品。2、采用超声法合成了GdPO4:Tb纳米发光材料,在pH=2时样品为纳米棒状结构,样品的结晶度很好,而在pH=10时样品为类似球状的纳米颗粒,且结晶度较低。pH值为10时的发光强度比pH值为2时的发光强度大。在加入甘氨酸后,由于配合物的形成,有利于GdPO4晶体的生长,样品的发光强度增加。3、采用超声法合成了GdPO4:(Ce,Tb)纳米发光材料,加入柠檬酸影响了产品的形貌,随着柠檬酸量的增大,样品颗粒的长度逐渐减小,颗粒的宽度逐渐增大,并且在柠檬酸与钆离子物质的量之比为2:1时,样品结晶度较好、颗粒较大,发光效果最好。
[Abstract]:Due to the unique electronic structure and transition mode of rare earth ions, rare earth nano-luminescent materials have been widely used in optoelectronic devices, information display. As a new generation of luminescent materials, rare earth nano-luminescent materials have become one of the hot research topics at home and abroad. Ultrasonic method is easy to operate and can be used in a short time. At low temperature, the advantages of high purity, fine particle size and uniform distribution of materials have been paid attention to. In this paper, we synthesized the luminescent materials doped with europium and terbium with gadolinium phosphate as substrate by XRD. The crystal shape, morphology and luminescence properties of the samples were characterized and analyzed by SEM IR and PL. The concentration of doped ions, pH value of solution and calcination temperature were discussed. The effects of citric acid and glycine on the morphology, crystal structure and luminescence properties were also investigated. The relationship among the structure, morphology and properties was also investigated. The main contents include: 1. The nanocrystalline GdPO4:Eu luminescent materials synthesized by ultrasonic method were nanorods at pH = 2:00, and the crystallinity of the samples was very good, while at pH = 10:00 the samples were spherical like nanoparticles. The luminescence intensity of the sample with lower crystallinity and pH value of 10:00 is higher than that of the sample with pH value 2:00. The sample calcined at high temperature loses the crystalline water and changes from hexagonal system to monoclinic system. The luminescence intensity of the sample calcined at 1000 鈩，

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