氧化物同軸納米電纜的組裝技術及其光學性能的研究
發(fā)布時間：2019-03-21 20:07
【摘要】：隨著納米材料在人們日常生產生活中的廣泛應用,氧化物同軸納米電纜作為其中獨特的一員,集核殼異質結構和納米材料的基本特性于一體,在近年來成為一個新的研究熱點。ZnO禁帶寬度為3.37 eV,激子束縛能高達60 meV,是能夠吸收紫外光至可見光的廉價氧化物。納米ZnO由于存在大量缺陷,在常溫下易發(fā)出藍綠光,廣泛的應用于熒光材料。Y_2O_3具有耐熱,抗腐蝕、高溫穩(wěn)定性,高介電常數(shù)等優(yōu)異的光學性能。摻入三價Eu~(3+)后,是一種優(yōu)良的紅色熒光材料。結合同軸納米電纜結構特性及以上各類材料發(fā)光性能,能夠通過調整外部激發(fā)條件或內部物質含量調整材料的發(fā)光性能,實現(xiàn)白光發(fā)光。本文主要通過利用XRD、SEM、TEM、PL等現(xiàn)代材料研究方法對制備的材料的物象、微觀結構、光學性能以及材料的結構——性能之間的聯(lián)系進行的表征和分析。具體工作內容如下:1.采用氧化鋁模板先電輔助沉積后溶膠凝膠法制備Eu_2O_3/ZnO同軸納米電纜,ZnO殼層厚度為15 nm,芯層直徑為30 nm。ZnO為纖鋅礦結構、Eu_2O_3為體心立方結構。在200 nm~500 nm波長激發(fā)下,發(fā)射光譜中出現(xiàn)隨著激發(fā)波長降低而降低的ZnO帶隙發(fā)光(380 nm)與間隙鋅綠光發(fā)射平臺(400 nm~500 nm)。在200 nm~245 nm波長范圍內激發(fā)下,出現(xiàn)寬的Eu~(3+)離子的~5D_0→~7F_1為主的躍遷,證實了系統(tǒng)存在能量電荷轉移和能量傳輸?shù)倪^程。在250 nm~295 nm波長范圍內激發(fā)下,發(fā)光以Eu~(3+)的~5D_0→~7F_2躍遷為主。395 nm和465 nm激發(fā)下存在Eu_2O_3的~7F_0→~5L_6和~7F_0→~5D_2躍遷直接吸收,出現(xiàn)反常的黃光和紅光發(fā)射。發(fā)射峰強度和位置隨著激發(fā)波長的改變而改變,實現(xiàn)了通過調整外界條件,調制同軸電纜的發(fā)光性能。在280 nm激發(fā)下,Eu_2O_3/ZnO同軸納米電纜發(fā)出白色的光。2.采用氧化鋁模板先電輔助沉積,后溶膠凝膠法,制備ZnO:Tb~(3+)/Y_2O_3:Eu~(3+)同軸納米電纜,殼層厚度為20 nm,芯層直徑為30 nm。250 nm波長激發(fā)下,發(fā)射光譜中ZnO綠光發(fā)射很強證明了同軸納米電纜存在大量缺陷。以554 nm和612 nm為監(jiān)控波長的激發(fā)光譜中出現(xiàn)均出現(xiàn)氧空位吸收峰,證實了氧空位參與與稀土離子之間的能量傳遞。同時出現(xiàn)較強的Eu~(3+)離子的~7F_0→~5D_2躍遷,證明了材料中Eu~(3+)大部分進入Y_2O_3非反演對稱中心C_2位置。250 nm波長激發(fā)下隨著Eu~(3+)摻雜量的增加,紅色熒光隨之增加。Tb和Eu的摩爾比在4:2和5:2時樣品實現(xiàn)白光發(fā)射。實現(xiàn)了通過改變內部稀土含量,調制納米電纜的發(fā)光性能。
[Abstract]:With the wide application of nano-materials in people's daily production and life, oxide coaxial nanowires, as one of the unique members, integrate the core-shell heterostructure and the basic properties of nano-materials in one. The band gap of 3.37 eV, exciton binding energy up to 60 meV, is a cheap oxide which can absorb ultraviolet light to visible light. Due to a large number of defects, nano-ZnO is easy to emit blue-green light at room temperature, and is widely used in fluorescent materials. Y _ 2O_3 has excellent optical properties such as heat resistance, corrosion resistance, high temperature stability, high dielectric constant and so on. Doped with trivalent Eu~ (3), it is an excellent red fluorescent material. Combined with the structure characteristics of coaxial nanowires and the luminescent properties of all kinds of materials above, white luminescence can be achieved by adjusting the external excitation conditions or the content of internal materials to adjust the luminescent properties of the materials. In this paper, the object image, microstructure, optical properties and the relationship between the structure and properties of the prepared materials are characterized and analyzed by means of modern material research methods such as XRD,SEM,TEM,PL and so on. The specific contents of the work are as follows: 1. Eu_2O_3/ZnO coaxial nanowires were prepared by alumina template electrodeposition followed by sol-gel method. The thickness of ZnO shell was 15 nm, core layer diameter was 30 nm.ZnO wurtzite structure and Eu_2O_3 was body centered cubic structure. At 200 nm~500 nm wavelength excitation, ZnO band gap luminescence (380 nm) and gap zinc green emission platform (400 nm~500 nm).) appear in the emission spectrum, which decrease with the decrease of excitation wavelength. Under excitation in the wavelength range of 200 nm~245 nm, the transition of the wide Eu~ (3) ion is dominated by the ~ 5D_0 ~ 7F_1, which proves that there is a process of energy charge transfer and energy transfer in the system. Under the excitation in the wavelength range of 250 nm~295 nm, the ~ 5D_0 ~ 7F_2 transition of Eu~ (3) is dominant. The ~ 7F_0 ~ 5L_6 and ~ 7F_0 ~ 5D_2 transitions of Eu_2O_3 are directly absorbed under the excitation of 395 nm and 465 nm. Abnormal yellow and red emission occurs. The intensity and position of the emission peak change with the change of the excitation wavelength, and the luminescence performance of the coaxial cable is modulated by adjusting the external conditions. Under the excitation of 280 nm, Eu_2O_3/ZnO coaxial nanowires emit white light. The ZnO:Tb~ _ (3) / Y _ 2O _ 2O _ 3 / EU ~ (3) coaxial cable was prepared by alumina template electrodeposition and then sol-gel method. The thickness of the shell layer was 20 nm, and the diameter of the core layer was 30 nm.250 nm. The strong green emission of ZnO in the emission spectrum proves that there are a lot of defects in coaxial nanowires. Oxygen vacancy absorption peaks appeared in the excitation spectra with 554 nm and 612 nm as monitoring wavelengths, which confirmed that oxygen vacancies were involved in the energy transfer between rare earth ions and oxygen vacancies. At the same time, strong ~ 7F_0 ~ 5D_2 transitions of Eu~ (3) ions are observed. It is proved that most of the Eu~ (3) in the material enters the position of C ~ (2 +) at the asymmetric symmetry center of Y_2O_3. Under the excitation of 250 nm wavelength, the doping amount of Eu~ (3) increases with the increase of the doping amount of Eu~ (3). The red fluorescence increases and the molar ratio of TB and Eu is 4:2 and 5: 2. The white light emission of the sample is achieved. The luminescent properties of nanowires are modulated by changing the content of inner rare earth.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1
本文編號：2445275
[Abstract]:With the wide application of nano-materials in people's daily production and life, oxide coaxial nanowires, as one of the unique members, integrate the core-shell heterostructure and the basic properties of nano-materials in one. The band gap of 3.37 eV, exciton binding energy up to 60 meV, is a cheap oxide which can absorb ultraviolet light to visible light. Due to a large number of defects, nano-ZnO is easy to emit blue-green light at room temperature, and is widely used in fluorescent materials. Y _ 2O_3 has excellent optical properties such as heat resistance, corrosion resistance, high temperature stability, high dielectric constant and so on. Doped with trivalent Eu~ (3), it is an excellent red fluorescent material. Combined with the structure characteristics of coaxial nanowires and the luminescent properties of all kinds of materials above, white luminescence can be achieved by adjusting the external excitation conditions or the content of internal materials to adjust the luminescent properties of the materials. In this paper, the object image, microstructure, optical properties and the relationship between the structure and properties of the prepared materials are characterized and analyzed by means of modern material research methods such as XRD,SEM,TEM,PL and so on. The specific contents of the work are as follows: 1. Eu_2O_3/ZnO coaxial nanowires were prepared by alumina template electrodeposition followed by sol-gel method. The thickness of ZnO shell was 15 nm, core layer diameter was 30 nm.ZnO wurtzite structure and Eu_2O_3 was body centered cubic structure. At 200 nm~500 nm wavelength excitation, ZnO band gap luminescence (380 nm) and gap zinc green emission platform (400 nm~500 nm).) appear in the emission spectrum, which decrease with the decrease of excitation wavelength. Under excitation in the wavelength range of 200 nm~245 nm, the transition of the wide Eu~ (3) ion is dominated by the ~ 5D_0 ~ 7F_1, which proves that there is a process of energy charge transfer and energy transfer in the system. Under the excitation in the wavelength range of 250 nm~295 nm, the ~ 5D_0 ~ 7F_2 transition of Eu~ (3) is dominant. The ~ 7F_0 ~ 5L_6 and ~ 7F_0 ~ 5D_2 transitions of Eu_2O_3 are directly absorbed under the excitation of 395 nm and 465 nm. Abnormal yellow and red emission occurs. The intensity and position of the emission peak change with the change of the excitation wavelength, and the luminescence performance of the coaxial cable is modulated by adjusting the external conditions. Under the excitation of 280 nm, Eu_2O_3/ZnO coaxial nanowires emit white light. The ZnO:Tb~ _ (3) / Y _ 2O _ 2O _ 3 / EU ~ (3) coaxial cable was prepared by alumina template electrodeposition and then sol-gel method. The thickness of the shell layer was 20 nm, and the diameter of the core layer was 30 nm.250 nm. The strong green emission of ZnO in the emission spectrum proves that there are a lot of defects in coaxial nanowires. Oxygen vacancy absorption peaks appeared in the excitation spectra with 554 nm and 612 nm as monitoring wavelengths, which confirmed that oxygen vacancies were involved in the energy transfer between rare earth ions and oxygen vacancies. At the same time, strong ~ 7F_0 ~ 5D_2 transitions of Eu~ (3) ions are observed. It is proved that most of the Eu~ (3) in the material enters the position of C ~ (2 +) at the asymmetric symmetry center of Y_2O_3. Under the excitation of 250 nm wavelength, the doping amount of Eu~ (3) increases with the increase of the doping amount of Eu~ (3). The red fluorescence increases and the molar ratio of TB and Eu is 4:2 and 5: 2. The white light emission of the sample is achieved. The luminescent properties of nanowires are modulated by changing the content of inner rare earth.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1
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