稀土离子掺杂氟化镧纳米材料的制备及其发光性能的研究

发布时间：2018-05-30 14:52

本文选题：铕掺杂氟化镧 + 铽掺杂氟化镧　；参考：《南昌大学》2015年硕士论文

【摘要】：近几年,RE3+掺杂有机-无机杂化材料由于其良好的发光性能而得到广泛的关注。在本论文中,主要制备了LaF3:Eu3+和LaF3:Tb3+纳米发光材料以及它们的有机-无机杂化材料,并研究了其发光性能,具体内容分以下三部分:(1)首先用水热法合成了LaF3纳米材料,接着用一种新的离子交换法合成Eu3+掺杂LaF3纳米材料。之后,用苯甲酸(BA)和2-噻吩甲酰三氟丙酮(TTA)作为敏化剂包覆在LaF3:Eu3+纳米粒子表面。XRD和TEM表征手段显示所制备的LaF3纳米材料为六方晶系LaF3,其形状为六方纳米片状,直径在25-40 nm之间,厚度约4-7 nm。FTIR显示BA(或TTA)与稀土激活离子Eu3+形成有机配体。PL谱对不同Eu3+浓度、不同退火温度及有机物的能量传递对LaF3:Eu3+发光性能的影响作出详细的表述。结果表明,由于有机配体的能量传递,使BA(TTA)包覆LaF3:Eu3+纳米材料的发光强度显著提高。最后,讨论了LaF3:Eu3+-BA和LaF3:Eu3+-TTA能量传递机理及有机配体提高发光强度的原因。(2)LaF3:Tb3+是一种重要的发绿光的纳米材料。但由于其低的光学吸收,限制了发光性能。在本论文中,由于有机物的能量转换,使形成的有机-无机杂化材料的发光性能得到提高。先用水热法合成了LaF3纳米材料,接着用离子交换法合成Tb3+掺杂LaF3纳米材料,并以BA作为有机配体,包覆在LaF3:Tb3+纳米粒子的表面。由于BA的能量传递,使LaF3:Tb3+-BA的发光性能有了显著的提高,其发光强度是之前未包覆BA的LaF3:Tb3+的44倍之多。并对Tb3+离子的最佳掺杂浓度和BA的最佳包覆量做了具体的研究。(3)用水热法一步合成LaF3:Eu3+纳米材料,并同时用BA和TTA包覆LaF3:Eu3+纳米材料,从而形成从200 nm-420 nm一个很宽的激发谱。
[Abstract]:In recent years, organic and inorganic hybrid materials doped with RE3 have received wide attention due to their good luminescence properties. In this thesis, LaF3:Eu3 and LaF3:Tb3 nano-luminescent materials and their organic-inorganic hybrid materials were prepared, and their luminescence properties were studied. The specific contents are as follows: 1) first, LaF3 nanomaterials were synthesized by hydrothermal method. Then Eu3 doped LaF3 nanomaterials were synthesized by a new ion exchange method. After that, LaF3:Eu3 nanoparticles were coated with benzoic acid and 2-thiophenyl trifluoroacetone as sensitizers. XRD and TEM characterization showed that the LaF3 nanocrystals were hexagonal LaF3 with a shape of hexagonal nanocrystals with diameters ranging from 25 to 40 nm. The thickness of 4-7 nm.FTIR shows that the effects of different Eu3 concentration, annealing temperature and energy transfer of organic compounds on the luminescence properties of LaF3:Eu3 are described in detail by the formation of organic ligand. PL spectra of BA- (or TTA-TTA) and rare earth activated ion Eu3. The results show that due to the energy transfer of organic ligands, the luminescence intensity of LaF3:Eu3 nanomaterials coated with Ba-TTA is improved significantly. Finally, the energy transfer mechanism of LaF3:Eu3 BA and LaF3:Eu3 TTA and the reason why organic ligands increase luminescence intensity are discussed. However, due to its low optical absorption, the luminescence performance is limited. In this thesis, the luminescence properties of organic-inorganic hybrid materials are improved due to the energy conversion of organic matter. LaF3 nanomaterials were synthesized by hydrothermal method and then Tb3 doped LaF3 nanomaterials were synthesized by ion exchange method. BA was used as organic ligand and coated on the surface of LaF3:Tb3 nanoparticles. Because of the energy transfer of BA, the luminescence performance of LaF3:Tb3-BA is greatly improved, and its luminescence intensity is 44 times as much as that of LaF3:Tb3 without BA. The optimum doping concentration of Tb3 ion and the optimum coating amount of BA were studied in detail. The LaF3:Eu3 nanomaterials were synthesized by hydrothermal method, and the LaF3:Eu3 nanomaterials were coated with BA and TTA at the same time, thus a wide excitation spectrum was formed from 200 nm-420 nm.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TQ133.3

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