稀土离子掺杂玻璃陶瓷的发光以及光温性质研究

发布时间：2018-02-21 05:41

本文关键词： 纳米陶瓷稀土离子光温传感荧光强度比　出处：《南京邮电大学》2017年硕士论文　论文类型：学位论文

【摘要】：稀土离子掺杂的上转换材料在许多领域中有着广泛的使用,例如红外激发的可见光检测,三维显示和光温传感材料等。在这些应用中,基于热耦合能级的荧光强度比(FIR)技术的光温传感材料由于灵敏度高,受环境因素小等因素,被认为实现纳米测温的关键技术手段。本文为了实现透明纳米陶瓷材料中的纳米测温技术,通过高温固相法制备了Er~(3+)-Tm~(3+)共掺杂NaGdF_4,Yb~(3+),Er~(3+),Tm~(3+)共掺杂LaSr2F7和Er~(3+)-Tm~(3+)共掺杂NaYbF_4三种纳米陶瓷,系统的研究了这些材料在红外激发下的光温传感性质。具体内容如下:第一章,系统地介绍了稀土掺杂材料的制备方法,光温传感机理和研究现状,以及存在的科学问题。第二章,通过高温固相法制备了Er~(3+)-Tm~(3+)共掺杂NaGdF_4的透明纳米陶瓷。用透射电镜和X射线衍射研究了内部的微观尺寸和形貌。分析了Er~(3+)单掺杂NaGdF_4纳米陶瓷的激发光谱和Er~(3+)-Tm~(3+)共掺杂NaGdF_4的荧光光谱,并进行了能级分析。在980 nm红外光激发下研究了样品的相邻热耦合能级荧光强度比随温度的变化关系,确定了相应的函数关系。计算了光温传感器的灵敏度,结果显示在334K达到了最大灵敏度为0.001K-1,这表明了Er~(3+)-Tm~(3+)共掺杂NaGdF_4纳米陶瓷在中低温范围具有光温传感应用前景。第三章,通过高温固相法制备了Yb~(3+),Er~(3+),Tm~(3+)共掺杂透明LaSr_2F_7纳米陶瓷。用透射电镜和X射线衍射方法研究内部微观的形状。在980nm红外光激发下,并研究了Tm~(3+)离子的相邻热耦合能级荧光强度比随温度的变化关系。计算其荧光强度比与灵敏度,结果显示546K左右时达到了最大灵敏度6.86×10-5K-1,这表明该纳米陶瓷在高温段光温传感有潜在的应用。第四章,通过高温固相法制备了Er~(3+)-Tm~(3+)共掺杂透明NaYbF_4的纳米陶瓷。用透射电镜和X射线衍射研究了内部的微观尺寸和形貌。测试了980 nm波长激发下的变温荧光光谱。计算了该陶瓷的热淬灭和温度的变化关系,发现了其Er~(3+)离子与Tm~(3+)都具有热耦合现象。通过研究Er~(3+)和Tm~(3+)相邻热耦合能级的荧光强度比随温度的变化关系,并计算光温传感器的灵敏度,发现Er~(3+)离子的一对热耦合能级在238K左右达到了最大灵敏度0.0037K-1,而Tm~(3+)离子的一对热耦合能级在1260K左右达到了最大灵敏度0.0005K-1。这说明我们的陶瓷材料节能实现高温光温传感又能实现低温光温传感。
[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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ171.112

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