稀土Sm掺杂八羟基喹啉铜薄膜的特性研究
发布时间：2019-05-21 18:16
【摘要】：有机半导体材料由于其优异的光电性质、柔韧性好、制备简单、性质可化学修饰、以及结构可塑性强等特点越来越受到人们的关注。有机半导体主要是由C、H、O、N等轻元素组成,并且元素之问的轨道耦合作用弱,自旋弛豫时间极长,在自旋电子学领域也具有极大的应用潜力。其中,有机小分子8-羟基喹啉金属配合物,结构简单,制备方便,具有优异的光电性质且稳定性好,在OLED、有机纳米器件、有机自旋阀器件等领域显示出巨大的应用前景。8-羟基喹啉铜(Cuq2)分子构造简单且性质优越,分子结构可呈现宏观可视相变。Cuq2分子还是一种具有自发自旋极化的材料,在有机磁体及有机自旋电子学等领域具有重要的应用潜力,是目前有机分子研究的热点材料之一。本论文选择8-羟基喹啉铜材料,主要进行了两方面工作：一、通过真空热蒸发方法制备了8-羟基喹啉铜薄膜,然后通过在不同温度下退火,观察到了样品从非晶薄膜到有机晶体的生长过程,并研究了材料发光性质的变化；二、通过对8-羟基喹啉铜进行稀土元素掺杂,研究了材料的结构及磁性变化。主要研究内容和结果如下：(1)采用有机热蒸发设备制备出纯8-羟基喹啉铜(Cuq2)以及Sm和Dy掺杂Cuq2薄膜,首次发现了稀土元素掺杂后的Cuq2薄膜在室温下具有本征铁磁性,其掺杂薄膜的饱和磁化强度和矫顽力可随着掺杂比例的减小而增强。并且对Sm掺杂Cuq2薄膜和纯Cuq2薄膜进行了FTIR光谱分析,发现了光谱的变化,旧峰的消失和新峰的出现,说明Sm原子和Cuq2进行了成键。(2)我们对纯Cuq2薄膜和经过掺杂Sm的Cuq2薄膜,进行退火后表面形貌的研究,发现了Cuq2微／纳米晶粒,且有些晶体的尺寸较大、规则性好。这表明退火后的Cuq2薄膜其结晶性效果更好,并且随着温度的升高,单晶尺度更大。这其中退火的温度分别为0℃,80℃,100℃,120℃,150℃,退火的时间为两个小时,退火时的高纯Ar气速率为0.3L/min,并且Sm和Cuq2的掺杂比例均为摩尔比1：1。(3)通过对PL谱研究我们发现纯Cuq2薄膜室温下具有较弱的发光性能,但是低温下发光性能较好,尤其是在220K时,主峰位出现了蓝移现象,且PL谱呈现RGB三色,并且重离子Cu掺入薄膜中其发光性能受到很大影响,光致发光更弱,而稀土离子Sm掺杂进去后,其发光性能更好。
[Abstract]:Organic semiconductor materials have attracted more and more attention because of their excellent optoelectronic properties, good flexibility, simple preparation, chemical modification of properties and strong structural plasticity. Organic semiconductors are mainly composed of light elements such as C, H, O, N, etc., and the orbital coupling of elements is weak, the spin relaxation time is very long, and it also has great application potential in the field of spin electronics. Among them, the organic small molecule 8-hydroxyquinoline metal complex has the advantages of simple structure, convenient preparation, excellent optoelectronic properties and good stability. In OLED, organic nanodevices, Organic spin valve devices and other fields show great application prospects. 8-hydroxyquinolincopper (Cuq2) molecule has simple structure and superior properties, and its molecular structure can show macroscopic visual phase transition. Cuq2 molecule is also a kind of material with spontaneous spin polarization. It has important application potential in the fields of organic magnets and organic spin electronics, and it is one of the hot materials in the research of organic molecules at present. In this paper, 8-hydroxyquinolin copper material was selected, and two main works were carried out: first, 8-hydroxyquinolin copper thin film was prepared by vacuum thermal evaporation, and then annealed at different temperatures. The growth process from amorphous thin film to organic crystal was observed, and the change of luminous properties of the material was studied. Secondly, the structure and magnetic properties of 8-hydroxyquinolin copper were studied by doping 8-hydroxyquinoline copper with rare earth elements. The main research contents and results are as follows: (1) Pure 8-hydroxyquinolincopper (Cuq2) and Sm and Dy doped Cuq2 thin films were prepared by organic thermal evaporation equipment. It is found for the first time that the rare earth doping Cuq2 thin films have intrinsic ferromagnetism at room temperature. The saturation magnetization and coercive force of the films can be increased with the decrease of doping ratio. FTIR spectra of Sm doped Cuq2 thin films and pure Cuq2 thin films were carried out. The changes of spectra, the disappearance of old peaks and the emergence of new peaks were found. It is shown that Sm atom and Cuq2 are bonded. (2) the surface morphology of pure Cuq2 thin films and Cuq2 thin films doped with Cuq2 has been studied after annealing. Cuq2 micro / nanometer grains have been found, and some crystals have large size and good regularity. This shows that the crystallization effect of annealed Cuq2 thin films is better, and the single crystal scale is larger with the increase of temperature. The annealing temperature is 0 鈩，
本文编号：2482287
[Abstract]:Organic semiconductor materials have attracted more and more attention because of their excellent optoelectronic properties, good flexibility, simple preparation, chemical modification of properties and strong structural plasticity. Organic semiconductors are mainly composed of light elements such as C, H, O, N, etc., and the orbital coupling of elements is weak, the spin relaxation time is very long, and it also has great application potential in the field of spin electronics. Among them, the organic small molecule 8-hydroxyquinoline metal complex has the advantages of simple structure, convenient preparation, excellent optoelectronic properties and good stability. In OLED, organic nanodevices, Organic spin valve devices and other fields show great application prospects. 8-hydroxyquinolincopper (Cuq2) molecule has simple structure and superior properties, and its molecular structure can show macroscopic visual phase transition. Cuq2 molecule is also a kind of material with spontaneous spin polarization. It has important application potential in the fields of organic magnets and organic spin electronics, and it is one of the hot materials in the research of organic molecules at present. In this paper, 8-hydroxyquinolin copper material was selected, and two main works were carried out: first, 8-hydroxyquinolin copper thin film was prepared by vacuum thermal evaporation, and then annealed at different temperatures. The growth process from amorphous thin film to organic crystal was observed, and the change of luminous properties of the material was studied. Secondly, the structure and magnetic properties of 8-hydroxyquinolin copper were studied by doping 8-hydroxyquinoline copper with rare earth elements. The main research contents and results are as follows: (1) Pure 8-hydroxyquinolincopper (Cuq2) and Sm and Dy doped Cuq2 thin films were prepared by organic thermal evaporation equipment. It is found for the first time that the rare earth doping Cuq2 thin films have intrinsic ferromagnetism at room temperature. The saturation magnetization and coercive force of the films can be increased with the decrease of doping ratio. FTIR spectra of Sm doped Cuq2 thin films and pure Cuq2 thin films were carried out. The changes of spectra, the disappearance of old peaks and the emergence of new peaks were found. It is shown that Sm atom and Cuq2 are bonded. (2) the surface morphology of pure Cuq2 thin films and Cuq2 thin films doped with Cuq2 has been studied after annealing. Cuq2 micro / nanometer grains have been found, and some crystals have large size and good regularity. This shows that the crystallization effect of annealed Cuq2 thin films is better, and the single crystal scale is larger with the increase of temperature. The annealing temperature is 0 鈩，
本文编号：2482287
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