稀土多聚磷酸盐纳米晶的制备及光学性能研究

发布时间：2018-05-18 02:05

本文选题：Li + Nd(PO3)4　；参考：《南京邮电大学》2015年硕士论文

【摘要】：稀土纳米发光材料的分散液因其良好的光学性能和散热性,在光学放大器和激光器等方面具有广阔的应用前景,有望成为新型流体激光器的增益介质。然而,即大的光学损耗和低的泵浦效率成为了阻碍其发展的两大瓶颈。针对该问题,本论文主要从减小材料粒径和开发兼有高激活离子浓度和长寿命的稀土纳米材料两方面入手,进行了以下三方面的工作。1小粒径Li Nd(PO3)4纳米晶制备方法的研究。通过对制备条件的反应机理的探索和分析,发展了一种使用EDTA和CA作为双络合剂来制备稀土多聚磷酸盐纳米晶的方法。该方法制备出的纳米晶晶型良好、光学性能优异,并具有一定的普适性,为小粒径稀土多聚磷酸盐纳米晶的的制备提供了方法参考。2 Nd P5O14纳米晶的制备及光学性能研究。采用溶胶-凝胶燃烧法,首次制备出Nd P5O14的纳米晶产物,平均粒径在20nm左右,且晶型结构完整,光学性能良好。该材料中Nd3+的浓度达到3.96×1021cm-3,室温下荧光寿命为114μs,仅次于大块晶体材料。是继Li Nd(PO3)4纳米晶之后,又一极具潜力的多聚磷酸盐类纳米晶激光增益材料。3 Nd P5O14纳米晶分散液的制备及光学性能研究。通过将Nd P5O14纳米晶分散在CHBr2CHBr2-DMSO混合溶剂中,得到了透明的纳米晶分散液。当分散液中Nd3+浓度为1×1020个/cm-3时,荧光寿命为110μs,同时1053nm处的透过率可达到为92.2%,800 nm处的吸收系数为5.9,由Judd-Ofelt模型计算可得,Nd P5O14纳米晶分散液的发射截面达到了8.4×10-20 cm2,远高于其他已报道材料。是一种十分具有潜力的新型流体激光材料。采用瑞利散射模型对分散液的损耗进行了分析,得到溶剂与Nd P5O14纳米晶之间的折射率差的绝对值为0.16左右,为进一步对分散液进行改进提供了参考。
[Abstract]:Due to its good optical properties and heat dissipation, the dispersion of rare earth nano-luminescent materials has a broad application prospect in optical amplifiers and lasers, which is expected to become a new type of fluid laser gain medium. However, large optical loss and low pump efficiency are the two bottlenecks that hinder its development. In order to solve this problem, the preparation methods of small particle size Li Nd(PO3)4 nanocrystals were studied from two aspects: reducing material size and developing rare earth nanomaterials with high active ion concentration and long lifetime. A method of preparing rare earth polyphosphate nanocrystals using EDTA and CA as double complexing agents was developed by exploring and analyzing the reaction mechanism of preparation conditions. The nanocrystalline prepared by this method has good crystal form, excellent optical properties and certain universality. It provides a method reference for the preparation of small size rare earth polyphosphate nanocrystals and the study of optical properties of 2.2ND P5O14 nanocrystals. ND P5O14 nanocrystalline products were prepared by sol-gel combustion method for the first time. The average particle size of ND P5O14 was about 20nm, the crystal structure was complete and the optical properties were good. The concentration of Nd3 is 3.96 脳 10 ~ (21) cm ~ (-3), and the fluorescence lifetime is 114 渭 s at room temperature, which is second only to the bulk crystal material. It is also a potential polyphosphate nanocrystalline laser gain material. 3 ND P5O14 nanocrystalline dispersion and its optical properties are studied after Li Nd(PO3)4 nanocrystalline. By dispersing ND P5O14 nanocrystalline in CHBr2CHBr2-DMSO mixed solvent, a transparent nanocrystalline dispersion was obtained. When the concentration of Nd3 in the dispersion is 1 脳 1020 / cm-3, The fluorescence lifetime is 110 渭 s, and the transmittance of 1053nm is 92.2nm and 800nm. The emission cross section of ND P5O14 nanocrystalline dispersion obtained by Judd-Ofelt model is 8.4 脳 10 ~ (-20) cm ~ (2), which is much higher than that of other reported materials. It is a new fluid laser material with great potential. Rayleigh scattering model was used to analyze the dispersion loss. The absolute value of refractive index difference between the solvent and ND P5O14 nanocrystals was about 0.16, which provided a reference for further improvement of the dispersion.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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