摘要荧光是光辐射的过程。适当的材料吸收辐射，接着就发出光，所发光子的能量比激发辐射的能量低。荧光粉是固体发光粉末。电子或高能离子或光子可以激发荧光粉。人们在实际生活中、制成弱照明光源，把这种材料涂在各种用品表面可以得到荧光效果。本论文主要是对稀土掺杂的锂硅酸盐Li2CaSiO4:Tb3+和Li2CaSiO4:Eu2+的制备过程和性能表征进行讨论，结合对热释光谱的拟合，分析其发光行为。通过以上研究扩展了Li2CaSiO4:Tb3+作为基质的荧光粉材料的种类。79734

本文用固相法制备发射绿色光的Li2CaSiO4:Tb3+材料，得到不同浓度的样品后，我们进行XRD粉末衍射测试，确定其反应最适温度为850℃，此时粉料为单一的纯相，没有任何多余杂相，它们晶体结构为四方相，。此后，通过测试其光致发光光谱（PLS）和荧光发射光谱图(PL)来表征不同浓度的样品的荧光性能。发射光谱及色谱显示，色度坐标为x=0。3161, y=0。5472，发光颜色为绿色。Li2CaSiO4:Tb3+的激发波长为290nm，发射光谱展现Tb3+离子的特征发射，有488nm，544nm（主峰），584nm，626nm四个发射峰。Tb3+掺杂浓度最佳值为0。01（原子比0。1%）。通过比对不同掺杂浓度的样品的发射光谱图，找到该荧光粉的浓度淬灭点为0，01，对其浓度淬灭主要因素进行分析，得出其发光淬灭的主要因素是Tb3+离子的双极-四极电子交互作用。

本文运用固相法在空气气氛下制备了发射蓝色光的荧光粉Li2CaSiO4:Eu2+的等浓度差的粉料。得到不同浓度的样品后，我们进行XRD粉末衍射测试，确定其反应最适温度为850℃，此时粉料为单一的纯相，没有任何多余杂相，它们晶体结构为四方相，。此后，通过测试其光致发光光谱（PLS）和荧光发射光谱图(PL)来表征不同浓度的样品的荧光性能。发射光谱及色谱显示，色度坐标x=0。1982, y=0。3542，发光颜色为绿色。Li2CaSiO4:Tb3+的激发波长为288nm，发射波长为487nm，为宽带发射。Eu2+的最佳掺杂浓度为0。01（原子比0。1%）。通过比对不同掺杂浓度的样品的发射光谱图，对其浓度淬灭主要因素进行分析，找到该荧光粉的浓度淬灭点为0。01，得出其发光淬灭的主要因素是Tb3+离子的双极-双极电子交互作用。

毕业论文关键词：Li2CaSiO4；固相反应；荧光粉；新型锂硅酸盐；热释光

Study on Luminescence Behavior of Rare Earth Doped Lithium Calcium Silicate

Abstract

Fluorescence is the process of light radiation。 The appropriate material absorbs radiation, and then emits light, and the energy of the emitted photon is lower than the energy that stimulates the radiation。 The phosphor is a solid luminescent powder。 Electron or high energy ions or photons can excite phosphors。 In this paper, the preparation of rare earth doped lithium silicate Li2CaSiO4: terbium and Li2CaSiO4: Eu2 + was carried out in this paper。 The preparation of rare earth-doped lithium silicate Li2CaSiO4: terbium and Li2CaSiO4: Eu2 + was carried out in real life。 Process and performance characterization。 The luminescence behavior of the Li2CaSiO4: Tb3 + as a matrix was expanded by the above studies to study the luminescence behavior of the thermoluminescence spectra。

In this paper, Li2CaSiO4: terbium ion with green light was prepared by solid-phase method。 After different concentrations of samples were obtained, XRD powder diffraction test was carried out to determine the optimum temperature of 850 ℃。 At this time, the powder was a single pure phase, There is no excess hybrids, their crystal structure for the tetragonal phase。 After that, the fluorescence properties of samples with different concentrations were characterized by testing their photoluminescence spectra (PLS) and fluorescence emission spectroscopy (PL)。 Emission spectrum and chromatogram show that the chromaticity coordinates are x = 0。3161, y = 0。5472, and the emission color is green。Li2CaSiO4: Tb3 + excitation wavelength is 290nm, the emission spectrum shows Tb3 + ion emission, with 488nm, 544nm (main peak) , 584nm, 626nm four emission peaks。 The optimum concentration of Tb3 + is 0。01 (atomic ratio 0。1%)。 By comparing the emission spectra of the samples with different doping concentrations, the concentration quenching point of the phosphor was found to be 0,01, and the main factors of concentration quenching were analyzed。 The main factors of quenching and quenching were terbium Bipolar - quadrupole electronic interaction。