本文關(guān)鍵詞： 納米陶瓷 稀土離子 光溫傳感 熒光強(qiáng)度比　出處：《南京郵電大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：稀土離子摻雜的上轉(zhuǎn)換材料在許多領(lǐng)域中有著廣泛的使用,例如紅外激發(fā)的可見光檢測,三維顯示和光溫傳感材料等。在這些應(yīng)用中,基于熱耦合能級的熒光強(qiáng)度比(FIR)技術(shù)的光溫傳感材料由于靈敏度高,受環(huán)境因素小等因素,被認(rèn)為實現(xiàn)納米測溫的關(guān)鍵技術(shù)手段。本文為了實現(xiàn)透明納米陶瓷材料中的納米測溫技術(shù),通過高溫固相法制備了Er~(3+)-Tm~(3+)共摻雜NaGdF_4,Yb~(3+),Er~(3+),Tm~(3+)共摻雜LaSr2F7和Er~(3+)-Tm~(3+)共摻雜NaYbF_4三種納米陶瓷,系統(tǒng)的研究了這些材料在紅外激發(fā)下的光溫傳感性質(zhì)。具體內(nèi)容如下:第一章,系統(tǒng)地介紹了稀土摻雜材料的制備方法,光溫傳感機(jī)理和研究現(xiàn)狀,以及存在的科學(xué)問題。第二章,通過高溫固相法制備了Er~(3+)-Tm~(3+)共摻雜NaGdF_4的透明納米陶瓷。用透射電鏡和X射線衍射研究了內(nèi)部的微觀尺寸和形貌。分析了Er~(3+)單摻雜NaGdF_4納米陶瓷的激發(fā)光譜和Er~(3+)-Tm~(3+)共摻雜NaGdF_4的熒光光譜,并進(jìn)行了能級分析。在980 nm紅外光激發(fā)下研究了樣品的相鄰熱耦合能級熒光強(qiáng)度比隨溫度的變化關(guān)系,確定了相應(yīng)的函數(shù)關(guān)系。計算了光溫傳感器的靈敏度,結(jié)果顯示在334K達(dá)到了最大靈敏度為0.001K-1,這表明了Er~(3+)-Tm~(3+)共摻雜NaGdF_4納米陶瓷在中低溫范圍具有光溫傳感應(yīng)用前景。第三章,通過高溫固相法制備了Yb~(3+),Er~(3+),Tm~(3+)共摻雜透明LaSr_2F_7納米陶瓷。用透射電鏡和X射線衍射方法研究內(nèi)部微觀的形狀。在980nm紅外光激發(fā)下,并研究了Tm~(3+)離子的相鄰熱耦合能級熒光強(qiáng)度比隨溫度的變化關(guān)系。計算其熒光強(qiáng)度比與靈敏度,結(jié)果顯示546K左右時達(dá)到了最大靈敏度6.86×10-5K-1,這表明該納米陶瓷在高溫段光溫傳感有潛在的應(yīng)用。第四章,通過高溫固相法制備了Er~(3+)-Tm~(3+)共摻雜透明NaYbF_4的納米陶瓷。用透射電鏡和X射線衍射研究了內(nèi)部的微觀尺寸和形貌。測試了980 nm波長激發(fā)下的變溫?zé)晒夤庾V。計算了該陶瓷的熱淬滅和溫度的變化關(guān)系,發(fā)現(xiàn)了其Er~(3+)離子與Tm~(3+)都具有熱耦合現(xiàn)象。通過研究Er~(3+)和Tm~(3+)相鄰熱耦合能級的熒光強(qiáng)度比隨溫度的變化關(guān)系,并計算光溫傳感器的靈敏度,發(fā)現(xiàn)Er~(3+)離子的一對熱耦合能級在238K左右達(dá)到了最大靈敏度0.0037K-1,而Tm~(3+)離子的一對熱耦合能級在1260K左右達(dá)到了最大靈敏度0.0005K-1。這說明我們的陶瓷材料節(jié)能實現(xiàn)高溫光溫傳感又能實現(xiàn)低溫光溫傳感。
[Abstract]:Rare earth ion-doped up-conversion materials are widely used in many fields, such as infrared excited visible light detection, three-dimensional display and photo-temperature sensing materials. Because of the high sensitivity and low environmental factors, the photoluminescence sensing materials based on the thermal coupling energy level are less sensitive than the FIRs. In order to realize the nanometer temperature measurement technology in transparent nano-ceramic materials, Three kinds of nanocrystalline ceramics were prepared by high temperature solid state method (Er~(3 / TmP3)) doped with NaGdF4 / YbP3) and co-doped with LaSr2F7 and Er~(3 / Tmf3). The photo-temperature sensing properties of these materials under infrared excitation were studied systematically. The main contents are as follows: chapter 1, the main contents of this paper are as follows: (1) in the first chapter, the optical and temperature sensing properties of these nanocrystalline ceramics under IR excitation have been studied systematically, and the results are as follows:. The preparation methods of rare earth doped materials, the mechanism of photo-temperature sensing, the current research situation, and the existing scientific problems are systematically introduced. Transparent nano-ceramics co-doped with Er~(3 ~ (Tm) ~ (3) NaGdF_4 were prepared by high temperature solid state method. The microstructure and morphology of NaGdF_4 were studied by transmission electron microscopy and X-ray diffraction. The excitation spectra and Er~(3 of Er~(3) doped NaGdF_4 nanocrystalline ceramics were analyzed. Fluorescence spectra of co-doped NaGdF_4, The dependence of the fluorescence intensity ratio of the adjacent thermally coupled energy levels on the temperature was studied under the excitation of 980nm infrared light, and the corresponding functional relationship was determined. The sensitivity of the photo-temperature sensor was calculated. The results show that the maximum sensitivity is 0.001K-1 at 334K, which indicates that the co-doped NaGdF_4 nano-ceramics have the prospect of photo-temperature sensing in the medium and low temperature range. Transparent Yb~(3 nanocrystalline LaSr_2F_7 ceramics were prepared by high temperature solid state method. The internal microstructures were studied by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The relationship between the fluorescence intensity ratio of adjacent thermally coupled energy levels and the temperature of the Tm~(3 ion is studied, and the fluorescence intensity ratio and sensitivity of the fluorescence intensity ratio and sensitivity are calculated. The results show that the maximum sensitivity is 6.86 脳 10 ~ (-5) K ~ (-1) at about 546K, which indicates that the nanocrystalline ceramic has a potential application in optical temperature sensing at high temperature. Chapter 4th, Nano-ceramics co-doped with transparent NaYbF_4 were prepared by high temperature solid state method. The microstructure and morphology of the ceramics were studied by transmission electron microscopy and X-ray diffraction. The fluorescence spectra at variable temperature excited at 980nm were measured and calculated. The relationship between the thermal quenching of the ceramic and the change of temperature is discussed. It is found that the Er~(3) ions and Tm~(3) have thermal coupling phenomenon. By studying the relationship between the fluorescence intensity ratio of the adjacent thermally coupled energy levels of Er~(3) and Tm~(3), the sensitivity of the photo-temperature sensor is calculated. It is found that the maximum sensitivity of a pair of thermally coupled energy levels of Er~(3) ions is 0.0037K-1 at 238K, and that of Tm~(3) ions is about 1260K. This shows that our ceramic materials can save energy and realize high temperature light. Temperature sensing can also realize low temperature light temperature sensing.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ171.112

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