本文選題：鉍 + 近紅外發(fā)光��； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：隨著信息社會(huì)的發(fā)展,數(shù)據(jù)在人類社會(huì)中扮演著越來(lái)越重要的角色,人們對(duì)數(shù)據(jù)流量的渴求達(dá)到了前所未有的程度,高速率和大容量成為光纖通信系統(tǒng)的研究重點(diǎn)。研制超寬帶光放大器是實(shí)現(xiàn)大容量光纖通信系統(tǒng)的關(guān)鍵,但是,傳統(tǒng)的稀土離子摻雜光纖放大器存在難以克服的缺陷,放大帶寬比較窄,盡管研究人員做出了很大的努力,稀土離子摻雜光纖放大器放大帶寬還是很難超過(guò)100 nm。與稀土離子相比,鉍元素在玻璃基質(zhì)中具有1000—1600 nm的超寬帶近紅外發(fā)光,這一范圍可以覆蓋石英光纖的整個(gè)低損耗通信窗口,鉍摻雜玻璃材料有望成為新一代超寬帶光放大器材料。本論文根據(jù)前人對(duì)鉍摻雜玻璃材料的研究,針對(duì)該種材料存在的問(wèn)題,選擇具有較好近紅外發(fā)光性能的鉍摻雜鉭鍺酸鹽玻璃體系進(jìn)行了系統(tǒng)的研究。研究了熔制時(shí)間對(duì)鉍摻雜鉭鍺酸鹽玻璃的均勻性及近紅外發(fā)光性能的影響,延長(zhǎng)熔制時(shí)間雖然可以改善玻璃的均勻性,但是也會(huì)造成材料中鉍的大量揮發(fā)。因此,我們希望通過(guò)向玻璃組分中引入堿金屬氧化物,降低玻璃的熔制溫度及熔制時(shí)間,以減少鉍的揮發(fā)。但是,堿金屬氧化物的引入會(huì)造成鉍摻雜鉭鍺酸鹽玻璃的分相,使玻璃中析出鉍金屬,另外,堿金屬氧化物通過(guò)破壞玻璃的網(wǎng)絡(luò)結(jié)構(gòu),使鉍的近紅外發(fā)光強(qiáng)度降低。在實(shí)驗(yàn)中,我們構(gòu)建出了堿金屬氧化物濃度、玻璃微結(jié)構(gòu)、鉍近紅外發(fā)光性能之間的關(guān)系。由于鉍對(duì)周圍基質(zhì)環(huán)境非常敏感,鉍的近紅外發(fā)射峰峰位隨著玻璃組分的不同會(huì)有很大的變化,我們?cè)趯?shí)驗(yàn)中建立了鉍摻雜鉭鍺酸鹽玻璃近紅外發(fā)射峰峰位與Ta2O5及Bi2O3濃度的定量關(guān)系,使我們能夠預(yù)測(cè)一定玻璃組分中鉍的近紅外發(fā)射峰峰位,這對(duì)鉍近紅外發(fā)光玻璃的組分設(shè)計(jì)具有指導(dǎo)意義。利用實(shí)驗(yàn)中制備的不同鉍摻雜鉭鍺酸鹽玻璃樣品,研究了不同組分玻璃中鉍的激發(fā)光譜及發(fā)射光譜的變化,依據(jù)激發(fā)光譜和發(fā)射光譜數(shù)據(jù),探討了鉍的近紅外發(fā)光機(jī)理,發(fā)現(xiàn)玻璃中鉍的近紅外發(fā)光來(lái)自不同的鉍活性中心�？紤]到該種材料器件化后的使用環(huán)境,探索了高溫對(duì)鉍摻雜鉭鍺酸鹽玻璃近紅外發(fā)光性能的影響,在不同Ta2O5和Bi2O3濃度的玻璃樣品中,近紅外發(fā)光強(qiáng)度的熱衰隨著溫度降低仍可以恢復(fù),但是隨著樣品中Li2O濃度的增加,樣品近紅外發(fā)光強(qiáng)度的熱衰變得逐漸不可恢復(fù)。為了探索鉍摻雜鉭鍺酸鹽玻璃利用管棒法制備光纖的可行性,研究了玻璃的熱學(xué)性能,隨著熱處理溫度升高,玻璃中會(huì)先后析出Ta2O5和Ge O2晶體,并且鉭鍺酸鹽玻璃軟化溫度比較高,希望通過(guò)引入Li2O降低玻璃軟化點(diǎn),但是隨著Li2O濃度的增加,鉍近紅外活性中心熱穩(wěn)定性變差,所以鉍摻雜近紅外發(fā)光玻璃中需要謹(jǐn)慎的引入堿金屬氧化物。
[Abstract]:With the development of information society, data plays a more and more important role in human society. The demand for data flow has reached an unprecedented degree. High speed and large capacity have become the research focus of optical fiber communication system. The development of ultra-wideband optical amplifier is the key to realize the large capacity optical fiber communication system. However, the traditional rare-earth ion doped fiber amplifier has some disadvantages, such as narrow amplification bandwidth, although researchers have made great efforts. The amplification bandwidth of rare-earth ion doped fiber amplifier is still difficult to exceed 100 nm. Compared with rare earth ions, bismuth has UWB near infrared luminescence of 1000-1600 nm in glass matrix, which can cover the whole low-loss communication window of quartz fiber. Bismuth-doped glass is expected to become a new generation of ultra-wideband optical amplifier materials. In this paper, based on the previous studies on bismuth-doped glass materials, the bismuth doped tantalum germanate glasses with good near infrared luminescence properties were selected to study systematically. The influence of melting time on the homogeneity and near infrared luminescence properties of bismuth doped tantalum germanate glasses was studied. Although prolonging the melting time can improve the homogeneity of the glass, it can also cause a large amount of volatilization of bismuth in the glass. Therefore, we hope to reduce the volatilization of bismuth by introducing alkali metal oxides into the glass components, reducing the melting temperature and melting time of the glass. However, the introduction of alkali metal oxide will lead to the separation of bismuth doped tantalum germanate glass and the precipitation of bismuth metal in the glass. In addition, the alkali metal oxide decreases the near infrared luminescence intensity of bismuth by destroying the network structure of the glass. In the experiment, the relationships among alkali metal oxide concentration, glass microstructures and near infrared luminescence properties of bismuth were obtained. Because bismuth is very sensitive to the surrounding matrix environment, the peak position of near infrared emission of bismuth varies greatly with the glass composition. The quantitative relationship between the peak position of near infrared emission of bismuth doped tantalum germanate glasses and the concentration of Ta2O5 and Bi2O3 has been established, which enables us to predict the near infrared emission peak of bismuth in certain glass components. It is of guiding significance for the composition design of bismuth near infrared luminescent glass. The changes of excitation and emission spectra of bismuth in different bismuth doped tantalum germanate glasses were studied. Based on the data of excitation and emission spectra, the near infrared luminescence mechanism of bismuth was discussed. It is found that the near infrared luminescence of bismuth in glass comes from different bismuth active centers. The effect of high temperature on the near infrared luminescence properties of bismuth doped tantalum germanate glass was investigated in consideration of the application environment of the device. In the glass samples with different Ta2O5 and Bi2O3 concentrations, The thermal decay of NIR luminescence intensity can be recovered with the decrease of temperature, but with the increase of Li2O concentration in the sample, the thermal decay of NIR luminescence intensity becomes gradually unrecoverable. The thermal properties of bismuth doped tantalum germanate glasses were studied in order to explore the feasibility of fabricating optical fibers by tube bar method. With the increase of heat treatment temperature, Ta2O5 and GE O 2 crystals were precipitated successively in the glass. The softening temperature of tantalum germanate glass is relatively high. We hope to reduce the softening point by introducing Li2O, but with the increase of Li2O concentration, the thermal stability of bismuth near infrared active center becomes worse. Therefore, bismuth doped near infrared luminescent glasses need careful introduction of alkali metal oxides.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ171.734

【共引文獻(xiàn)】

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本文編號(hào)：1978608