铒镱共掺铁酸镓陶瓷上转换发光性质研究

发布时间：2018-11-09 11:24

【摘要】：人们发现稀土上转换发光材料能够实现激发光能量的上转换,并在温度测定、红外辐射探测以及三维立体显示等领域有着巨大的应用潜力。选择合适的上转换基质材料,有利于稀土离子上转换发光效率的提高,所以寻找合适的上转换基质材料成为国内外研究的热点。而铁酸镓陶瓷(GaFeO_3)具有良好的物理化学稳定性,声子能量较低,适合作为稀土离子的基质材料。因此,本课题选择Er~(3+)和Yb~(3+)共掺的铁酸镓陶瓷(GaFeO_3)作为研究对象,研究其上转换发光性质。采用传统的固相烧结法制备一系列不同浓度Er~(3+)和Yb~(3+)掺杂的铁酸镓陶瓷,Er~(3+)的掺杂浓度依次为1%,2%,3%,4%和5%,而Yb~(3+)离子掺杂浓度均为5%。通过对制备出的样品进行XRD表征,拉曼光谱分析以及表面形貌表征等测试,检测所制备的样品是否合格。在室温条件下,采用970 nm的激光器对一系列不同浓度的铒镱双掺的铁酸镓陶瓷进行泵浦。通过分析其上转换发光光谱,发现猝灭浓度为4%,认为这是由于Er~(3+)离子浓度过高导致Er~(3+)离子之间发生了交叉驰豫过程,抑制了上转换荧光发射过程。还进行了对铒镱双掺的铁酸镓陶瓷进行上转换荧光强度与泵浦光能量关系的探究,通过对荧光强度与泵浦能量进行双对数拟合,我们发现拟合直线的斜率并不严格接近于上转换过程中吸收的光子数。通过外加不同大小的电场,研究铒镱双掺的铁酸镓陶瓷的上转换荧光强度与外加电场的关系,发现随着外加电场的不断增大,各个荧光峰值会逐渐减弱。还通过改变铒镱双掺的铁酸镓陶瓷样品的环境温度来研究上转换荧光发射强度对温度的响应特性。本实验首次得出了铒镱双掺的铁酸镓陶瓷的温度灵敏度曲线,为铁酸镓陶瓷应用为复杂变温环境下的上转换发光材料提供了实验依据。
[Abstract]:It has been found that rare earth up-conversion luminescent materials can realize the up-conversion of excited light energy and have great potential in the fields of temperature measurement infrared radiation detection and three-dimensional stereoscopic display. The selection of appropriate up-conversion matrix is beneficial to the improvement of luminescence efficiency of rare-earth ion upconversion, so finding suitable up-conversion substrate has become a hot topic at home and abroad. Gallium ferrate ceramics (GaFeO_3) have good physical and chemical stability and low phonon energy. Therefore, Er~ (3) and Yb~ (3) co-doped gallium ferrite ceramics (GaFeO_3) were selected as the research object in this paper, and their up-conversion luminescence properties were studied. A series of gallium ferrite ceramics with different concentrations of Er~ (3) and Yb~ (3) were prepared by traditional solid-state sintering method. The doping concentrations of Er~ (3) were 1% and 5% respectively. The doping concentration of Yb~ (3) ions is 5%. The samples were characterized by XRD, Raman spectroscopy and surface morphology. A series of erbium and ytterbium doped gallium ferrite ceramics with different concentrations were pumped by a 970 nm laser at room temperature. It is found that the quenching concentration is 4, which is attributed to the cross relaxation process between Er~ (3) ions due to the high concentration of Er~ (3) ions, which inhibits the up-conversion fluorescence emission process. The relationship between the up-conversion fluorescence intensity and the pump energy of erbium and ytterbium-doped gallium ferrite ceramics was also investigated. The fluorescence intensity and pump energy were fitted logarithmically. We find that the slope of the fitting line is not close to the number of photons absorbed in the upconversion process. The relationship between the up-conversion fluorescence intensity and the applied electric field of the erbium-ytterbium-doped gallium ferrite ceramics was studied by applying different electric fields. It was found that with the increasing of the applied electric field, each fluorescence peak value would weaken gradually. The response of up-conversion fluorescence emission intensity to temperature was also studied by changing the ambient temperature of Erbium-ytterbium-doped gallium ferrate ceramics. For the first time, the temperature sensitivity curves of erbium and ytterbium doped gallium ferrite ceramics are obtained, which provides experimental basis for the application of gallium ferrite ceramics to upconversion luminescent materials under complex temperature varying conditions.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ174.13

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