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首頁> 外文學位 >Sol-gel synthesis of fluoride glasses and thin films: The effects of processing on the chemical, physical, optical, and rare earth fluorescence properties of sol-gel ZBLA glasses.
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Sol-gel synthesis of fluoride glasses and thin films: The effects of processing on the chemical, physical, optical, and rare earth fluorescence properties of sol-gel ZBLA glasses.

機譯：氟化物玻璃和薄膜的溶膠-凝膠合成：加工對溶膠-凝膠ZBLA玻璃的化學，物理，光學和稀土熒光性質的影響。

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Fluoride glasses have the potential to be ultra-low loss optical fiber and active optical devices due to their intrinsic clarity, wide transmission window, and low phonon energy. Unfortunately, conventional processing methods have failed to produce defect free glasses, fibers, or thin films. However, sol-gel techniques offer high purity, low temperature processing routes conducive to high quality optics. Thus, a modified sol-gel technique was investigated as an alternative approach for fluoride glass production.; Hydrous oxide gels and thin films were prepared by hydrolyzing an alcoholic solution of alkoxides and hydroxides. Subsequent fluorination of the gels in gaseous hydrogen fluoride led to the successful formation of ZBLA ({dollar}rm 57ZrFsb4{dollar}-36BaF{dollar}sb2{dollar}-4LaF{dollar}sb3{dollar}-3AlF{dollar}sb3,{dollar} in mol%) fluoride glasses. However, the resulting glasses had inferior optical properties. The thermal processing and analysis of these materials was then studied to determine the cause of the poor transparency and to find a remedy.; The poor transparency of the sol-gel fluoride glasses was due to residual organics that led to carbon and reduced zirconium species that were strongly absorbing. However, optical quality glasses could be produced by removing these contaminants via treatment with a high temperature oxidizing atmosphere such as NF{dollar}sb3{dollar} or SF{dollar}sb6{dollar} without introducing other contaminants such as oxygen. The resulting glasses had chemical, electrical, mechanical, and optical properties commensurate with conventionally prepared glasses. It was also found that hydrocarbon contamination could be avoided altogether by using an inorganic sol-gel process involving the polymerization of zirconium hydroxychloride salts.; To study the gel structure and local environment of rare earth dopants during thermal processing and conversion of the gel, Eu{dollar}sp{lcub}3+{rcub}{dollar} fluorescence spectroscopy was employed. The Eu{dollar}sp{lcub}3+{rcub}{dollar} fluorescence revealed a change in site symmetry and decrease in host phonon energy upon fluorination. In addition to the well known red Eu{dollar}sp{lcub}3+{rcub}{dollar} luminescence, ultraviolet, blue, and green emissions were also observed in fluoride glasses and discovered to be concentration dependent. The Eu{dollar}sp{lcub}3+{rcub}{dollar} fluorescence was concluded to be a good probe for evaluating sol-gel fluoride materials and that the concentration dependence of the high energy emissions of Eu{dollar}sp{lcub}3+{rcub}{dollar} was due to electric dipole-dipole and dipole-quadrupole cross relaxations.
機譯：氟化物玻璃因其固有的清晰度，寬的透射窗和低聲子能量而具有成為超低損耗光纖和有源光學設備的潛力。不幸的是，常規(guī)的加工方法未能生產出無缺陷的玻璃，纖維或薄膜。然而，溶膠-凝膠技術提供了有助于高質量光學器件的高純度，低溫加工路線。因此，研究了改良的溶膠-凝膠技術作為氟化物玻璃生產的替代方法。通過水解醇鹽和氫氧化物的醇溶液制備含水氧化物凝膠和薄膜。隨后在氣態(tài)氟化氫中凝膠氟化導致ZBLA（{dollar} rm 57ZrFsb4 {dollar} -36BaF {dollar} sb2 {dollar} -4LaF {dollar} sb3 {dollar} -3AlF {dollar} sb3， {mol％}氟化物玻璃。然而，所得玻璃具有較差的光學性能。然后研究了對這些材料的熱處理和分析，以確定透明性差的原因并找到補救措施。溶膠-凝膠氟化物玻璃的差的透明度是由于殘留的有機物導致碳和還原的鋯物質強烈吸收而導致的。然而，可以通過在不引入諸如氧氣的其他污染物的情況下，通過用諸如NF {sb3 {dollar}或SF {dollar} sb6 {dollar}之類的高溫氧化氣氛進行處理來去除這些污染物來制造光學品質的玻璃。所得玻璃具有與常規(guī)制備的玻璃相當?shù)幕瘜W，電氣，機械和光學性能。還發(fā)現(xiàn)通過使用涉及羥基氯化鋯鹽聚合的無機溶膠-凝膠工藝可以完全避免烴污染。為了研究凝膠的熱加工和轉化過程中稀土摻雜劑的凝膠結構和局部環(huán)境，采用了Eu {dollar} sp {lcub} 3+ {rcub} {dollar}熒光光譜法。 Eu {dollar} sp {lcub} 3+ {rcub} {dollar}熒光顯示氟化后位點對稱性改變和宿主聲子能量降低。除了眾所周知的紅色Eu {dollar} sp {lcub} 3+ {rcub} {dollar}發(fā)光外，在氟化物玻璃中還觀察到了紫外線，藍色和綠色發(fā)射，并且發(fā)現(xiàn)它們與濃度有關。 Eu {dollar} sp {lcub} 3+ {rcub} {dollar}熒光被認為是評估溶膠-凝膠氟化物材料以及Eu {dollar} sp {lcub高能量排放物的濃度依賴性的良好探針。 } 3+ {rcub} {dollar}是由于電偶極-偶極和偶極-四極交叉弛豫。

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