稀土Sm摻雜八羥基喹啉銅薄膜的特性研究
發(fā)布時(shí)間：2019-05-21 18:16
【摘要】：有機(jī)半導(dǎo)體材料由于其優(yōu)異的光電性質(zhì)、柔韌性好、制備簡單、性質(zhì)可化學(xué)修飾、以及結(jié)構(gòu)可塑性強(qiáng)等特點(diǎn)越來越受到人們的關(guān)注。有機(jī)半導(dǎo)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(shí)間極長,在自旋電子學(xué)領(lǐng)域也具有極大的應(yīng)用潛力。其中,有機(jī)小分子8-羥基喹啉金屬配合物,結(jié)構(gòu)簡單,制備方便,具有優(yōu)異的光電性質(zhì)且穩(wěn)定性好,在OLED、有機(jī)納米器件、有機(jī)自旋閥器件等領(lǐng)域顯示出巨大的應(yīng)用前景。8-羥基喹啉銅(Cuq2)分子構(gòu)造簡單且性質(zhì)優(yōu)越,分子結(jié)構(gòu)可呈現(xiàn)宏觀可視相變。Cuq2分子還是一種具有自發(fā)自旋極化的材料,在有機(jī)磁體及有機(jī)自旋電子學(xué)等領(lǐng)域具有重要的應(yīng)用潛力,是目前有機(jī)分子研究的熱點(diǎn)材料之一。本論文選擇8-羥基喹啉銅材料,主要進(jìn)行了兩方面工作：一、通過真空熱蒸發(fā)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(jī)晶體的生長過程,并研究了材料發(fā)光性質(zhì)的變化；二、通過對8-羥基喹啉銅進(jìn)行稀土元素?fù)诫s,研究了材料的結(jié)構(gòu)及磁性變化。主要研究內(nèi)容和結(jié)果如下：(1)采用有機(jī)熱蒸發(fā)設(shè)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(fā)現(xiàn)了稀土元素?fù)诫s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(qiáng)度和矯頑力可隨著摻雜比例的減小而增強(qiáng)。并且對Sm摻雜Cuq2薄膜和純Cuq2薄膜進(jìn)行了FTIR光譜分析,發(fā)現(xiàn)了光譜的變化,舊峰的消失和新峰的出現(xiàn),說明Sm原子和Cuq2進(jìn)行了成鍵。(2)我們對純Cuq2薄膜和經(jīng)過摻雜Sm的Cuq2薄膜,進(jìn)行退火后表面形貌的研究,發(fā)現(xiàn)了Cuq2微／納米晶粒,且有些晶體的尺寸較大、規(guī)則性好。這表明退火后的Cuq2薄膜其結(jié)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(shí)間為兩個(gè)小時(shí),退火時(shí)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(fā)現(xiàn)純Cuq2薄膜室溫下具有較弱的發(fā)光性能,但是低溫下發(fā)光性能較好,尤其是在220K時(shí),主峰位出現(xiàn)了藍(lán)移現(xiàn)象,且PL譜呈現(xiàn)RGB三色,并且重離子Cu摻入薄膜中其發(fā)光性能受到很大影響,光致發(fā)光更弱,而稀土離子Sm摻雜進(jìn)去后,其發(fā)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
[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
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