發(fā)布時間：2018-03-15 02:00

  本文選題：磁光玻璃　切入點：發(fā)光性能　出處：《陜西科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題采用熔融法制備了高Verdet常數(shù)的Ge O2-B2O3-Si O2-Tb2O3(GBST)磁光玻璃,采用光學(xué)堿度、光學(xué)帶隙、稀土光譜理論等探究了磁光玻璃基本物理性能、結(jié)構(gòu)、光譜性能等,并探究了磁場及不同球磨方法對磁光玻璃發(fā)光性能的影響,主要研究結(jié)論如下:(1)隨著Tb2O3含量的增加,磁光玻璃的密度呈拋物線性增加,Verdet常數(shù)線性增加,且在Tb2O3含量為70 mol.%時為時密度和Verdet常數(shù)分別為6.248 g/cm3和-0.50 min/Oe·cm。光學(xué)堿度和氧離子極化率隨Tb2O3摩爾含量的增加而增大,高的光學(xué)堿度導(dǎo)致Tb3+離子的5d能級分裂加大,增加了磁光玻璃的磁矩和氧離子極化率,導(dǎo)致Verdet常數(shù)的加大;(2)GBST磁光玻璃試樣在Tb2O3含量為10 mol.%時穩(wěn)定性最高,析晶傾向最低。經(jīng)過析晶處理后可以得到Tb BO3晶體。含Tb3+離子的GBST磁光的網(wǎng)絡(luò)結(jié)構(gòu)是由[Si O4]、[BO3]和[BO4]等混合而成的,且玻璃中存在偏硼酸鹽形成大的無窮鏈狀結(jié)構(gòu),Tb3+填充在其中的兩個硼氧三角體[BO3]和一個硼氧四面體[BO4]之間的空隙中;(3)隨著Tb2O3摩爾含量的增加,磁光玻璃的吸收邊增加,光學(xué)帶隙降低,但他們變化的幅度不大。Tb3+離子的極化率較低,但其軌道能與O2-離子形成具有較大極化率的基團,電子云容易發(fā)生變形。隨著Tb3+離子的加入,非橋氧增加,玻璃的光學(xué)帶隙都減小;(4)GBST磁光玻璃的激發(fā)強度、發(fā)射強度及熒光壽命都隨著Tb2O3摩爾含量的增加呈現(xiàn)先增加后降低的趨勢,且在Tb2O3為10 mol.%時達到最大。(5D3,7F6)→(5D4,7F0)交叉弛豫是導(dǎo)致濃度猝滅的主要原因。熱處理后磁光玻璃試樣的發(fā)光強度增大,主要原因為形成微晶后,基質(zhì)的聲子能量降低,Tb3+在晶體場的作用下,降低了電子由高能級向低能級弛豫的幾率,使得高能級上的電子布局數(shù)增加;(5)引入磁場后,磁光玻璃的發(fā)光強度降低,Tb2O3含量與發(fā)光強度降低量關(guān)系不大,與磁光玻璃自身發(fā)光強度有關(guān)。即發(fā)光強度高的磁光玻璃,引入磁場后,發(fā)光強度降低量大。當(dāng)磁光玻璃粉的粒度降低后,其發(fā)光強度降低。在相同粒度下,濕磨工藝比干磨得到的熒光粉發(fā)光強度小,在實際應(yīng)用過程中,要獲得較好的發(fā)光性能,磁光玻璃粉應(yīng)采用干磨工藝,顆粒尺寸應(yīng)適當(dāng),結(jié)合激發(fā)條件、以及使用場合,來確定其大小。磁光玻璃粉體粒度越小,其相對比表面積越大,導(dǎo)致缺陷和猝滅中心的增加,降低了發(fā)光強度,此外水中的-OH與玻璃發(fā)生反應(yīng),使磁光玻璃粉表面的懸鍵變多,表面缺陷變多,導(dǎo)致熒光淬滅。
[Abstract]:The magneto-optic glass with high Verdet constant, GE O 2-B 2O 3-Si O 2-TB 2O 3 GST, was prepared by melting method. The basic physical properties, structure and spectral properties of magneto-optic glass were investigated by optical basicity, optical band gap and rare earth spectrum theory. The effects of magnetic field and different ball milling methods on the luminescence properties of magneto-optic glass are investigated. The main conclusions are as follows: 1) with the increase of Tb2O3 content, the density of magneto-optic glass increases linearly with parabola. When the content of Tb2O3 is 70 mol 路%, the duration density and Verdet constant are 6.248 g / cm ~ 3 and -0.50 min/Oe 路cm ~ (-1), respectively. The optical basicity and oxygen ion polarizability increase with the increase of Tb2O3 molar content, and the high optical basicity leads to the splitting of 5-day energy level of Tb3 ion. The magnetic moment and oxygen ion polarizability of magneto-optic glass were increased, which resulted in the highest stability of the magneto-optic glass sample when the Tb2O3 content was 10 mol 路%. After crystallization treatment, TB BO3 crystal can be obtained. The network structure of GBST containing Tb3 ion is composed of [Sio _ 4], [BO3] and [BO4]. Moreover, there are two boron triangles [BO3] and a boron tetrahedron [BO4] in which there is a large infinite chain structure formed by metaborates. The absorption edge of magneto-optic glass increases with the increase of Tb2O3 molar content. The optical band gap is decreased, but the polarizability of Tb3 ion is small. However, its orbital energy and O _ 2-ion form a group with large polarizability, and the electron cloud is prone to deform. With the addition of Tb3 ion, the non-bridged oxygen increases. The optical band gap of the glass decreases the excitation intensity, the emission intensity and the fluorescence lifetime of the glass increase first and then decrease with the increase of the molar content of Tb2O3, and reach the maximum value of .5D3O7F6 when the Tb2O3 is 10 mol 路%. 鈫扐fter heat treatment, the luminescence intensity of magneto-optic glass increased, the main reason was that the phonon energy of the matrix decreased under the action of crystal field. The probability of electron relaxation from high energy level to low energy level is reduced, and the number of electron configurations at high energy level increases by 5). When magnetic field is introduced, the decrease of luminescence intensity of magneto-optic glass is not related to the decrease of luminescence intensity. It is related to the luminescence intensity of magneto-optic glass, that is, the magneto-optic glass with high luminescence intensity decreases greatly with the introduction of magnetic field. When the particle size of magneto-optic glass decreases, its luminescence intensity decreases. The luminous intensity of phosphor produced by wet grinding is smaller than that by dry grinding. In order to obtain better luminous properties in practical application, the magneto-optic glass powder should adopt dry grinding technology, the particle size should be appropriate, and the excitation conditions should be combined, as well as the application situation. The smaller the granularity of magneto-optic glass powder, the larger its relative specific surface area, which leads to the increase of defect and quenching center, and decreases the luminescence intensity. In addition, the -OH in water reacts with glass, resulting in more hanging bonds on the surface of magneto-optic glass powder. More surface defects lead to fluorescence quenching.
【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ171.79

【參考文獻】

相關(guān)期刊論文 前5條

1 崔保偉;;磁光開關(guān)工作原理和設(shè)計方法[J];機電元件;2011年04期

2 陳平;雷衍連;劉榮;張巧明;張勇;熊祖洪;;DCM染料摻雜對有機電致發(fā)光磁效應(yīng)的影響[J];中國科學(xué)(G輯:物理學(xué) 力學(xué) 天文學(xué));2009年10期

3 周蓓明，王標(biāo)，毛涵芬，，蔣亞絲;TG28磁光玻璃[J];中國激光;1996年09期

4 王勝;錢奇;張勤遠;楊中民;姜中宏;;Gd~(3+)為敏化劑的摻Tb~(3+)硅酸鹽閃爍玻璃[J];無機材料學(xué)報;2009年04期

5 于春雷,戴世勛,周剛,張軍杰,胡麗麗,姜中宏;摻鉺碲酸鹽玻璃中的濃度猝滅機理研究[J];物理學(xué)報;2005年08期

相關(guān)博士學(xué)位論文 前1條

1 翁梓華;基于磁光光纖和高速磁場的全光纖磁光開關(guān)研究[D];浙江大學(xué);2005年

本文編號：1613898