【摘要】：有機半導體材料由于其優異的光電性質、柔韌性好、制備簡單、性質可化學修飾、以及結構可塑性強等特點越來越受到人們的關注。有機半導體主要是由C、H、O、N等輕元素組成,并且元素之問的軌道耦合作用弱,自旋弛豫時間極長,在自旋電子學領域也具有極大的應用潛力。其中,有機小分子8-羥基喹啉金屬配合物,結構簡單,制備方便,具有優異的光電性質且穩定性好,在OLED、有機納米器件、有機自旋閥器件等領域顯示出巨大的應用前景。8-羥基喹啉銅(Cuq2)分子構造簡單且性質優越,分子結構可呈現宏觀可視相變。Cuq2分子還是一種具有自發自旋極化的材料,在有機磁體及有機自旋電子學等領域具有重要的應用潛力,是目前有機分子研究的熱點材料之一。本論文選擇8-羥基喹啉銅材料,主要進行了兩方面工作：一、通過真空熱蒸發方法制備了8-羥基喹啉銅薄膜,然后通過在不同溫度下退火,觀察到了樣品從非晶薄膜到有機晶體的生長過程,并研究了材料發光性質的變化；二、通過對8-羥基喹啉銅進行稀土元素摻雜,研究了材料的結構及磁性變化。主要研究內容和結果如下：(1)采用有機熱蒸發設備制備出純8-羥基喹啉銅(Cuq2)以及Sm和Dy摻雜Cuq2薄膜,首次發現了稀土元素摻雜后的Cuq2薄膜在室溫下具有本征鐵磁性,其摻雜薄膜的飽和磁化強度和矯頑力可隨著摻雜比例的減小而增強。并且對Sm摻雜Cuq2薄膜和純Cuq2薄膜進行了FTIR光譜分析,發現了光譜的變化,舊峰的消失和新峰的出現,說明Sm原子和Cuq2進行了成鍵。(2)我們對純Cuq2薄膜和經過摻雜Sm的Cuq2薄膜,進行退火后表面形貌的研究,發現了Cuq2微／納米晶粒,且有些晶體的尺寸較大、規則性好。這表明退火后的Cuq2薄膜其結晶性效果更好,并且隨著溫度的升高,單晶尺度更大。這其中退火的溫度分別為0℃,80℃,100℃,120℃,150℃,退火的時間為兩個小時,退火時的高純Ar氣速率為0.3L/min,并且Sm和Cuq2的摻雜比例均為摩爾比1：1。(3)通過對PL譜研究我們發現純Cuq2薄膜室溫下具有較弱的發光性能,但是低溫下發光性能較好,尤其是在220K時,主峰位出現了藍移現象,且PL譜呈現RGB三色,并且重離子Cu摻入薄膜中其發光性能受到很大影響,光致發光更弱,而稀土離子Sm摻雜進去后,其發光性能更好。
[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，

本文編號：2482287