摘要稀土激发硅酸盐的发光体系因为具有独特的稳定性，发光性能优越的特点二受到国内外研究学者的关注。Li2MgSiO4是一种性能稳定的基质材料,通过与稀土离子掺杂的手段生成具有不同发光特性的材料，且目前在国内外研究的较少，引起了我们的关注。79756

本课题通过固相合成制备出红色发光 Li2MgSiO4:Eu3+, 绿色发光 Li2MgSiO4：Tb3+材料。运用激发光谱等多种无机实验中常用的化学分析仪器；通过改变稀土离子的掺杂比例和烧结温度，设置多组实验组别，得到最佳的锂镁硅酸盐发光材料的比例。

经多组实验对比和光谱得出结论，对于Li2MgSiO4:Eu3+发光材料，合适的合成温度为1250摄氏度。实验检测知道Tb3+离子的跃迁形式是D4-7Fj，在CIE色度坐标上的位置是X =0。3161，Y =0。5472。 Tb3+的最佳浓度为3％，其发射光谱在500-700nm发射，最高峰578nm。Eu3+的跃迁形式是5D0-7F1，在CIE色度坐标上对应的坐标是x=0。6672, y=0。3301。Eu3+最佳浓度确定3%。当紫外线光源被关闭，Li2MgSiO4: Tb3+和Li2MgSiO4: Eu3+，荧光粉发出红色光。热释光光谱表明， Li2MgSiO4:Tb3+体系价带中的电子和空穴的复合，是该体系的发光原理。Li2MgSiO4 : Eu3+体系和Li2MgSiO4:Tb3+体系发光材料发光性能和稀土离子的浓度有关，掺杂浓度达到最佳时陷阱浓度最大，发光亮度增加。

毕业论文关键词:光谱，热释光，掺杂浓度，烧结温度

 Spectroscopic Properties of Lithium Magnesium Silicate Excited by Rare Earth 

Abstract:   Rare earth excited silicate luminescence system because of its unique stability, excellent luminescence characteristics of the two by domestic and foreign scholars of concern。 Li2MgSiO4 is a stable matrix material, and it has attracted much attention at home and abroad by generating materials with different luminescent properties by means of doping with rare earth ions。

In this paper, the red luminescent Li2MgSiO4: Eu3+, green luminescent Li2MgSiO4: Tb3+ materials were prepared by solid phase synthesis。 The use of excitation spectrum and other inorganic experiments commonly used in chemical analysis equipment; by changing the rare earth ion doping ratio and sintering temperature, set up multiple experimental groups, the best lithium magnesium silicate luminescent material ratio。

The experimental results show that for the Li2MgSiO4: Eu3+ luminescent material, the suitable synthesis temperature is 1250 degrees Celsius。 The experimental results show that the transition form of Tb3+ is 5D4-7Fj, and the position on the CIE chromaticity coordinates is X = 0。3161 and Y = 0。5472。 The optimal concentration of Tb3+ + is 3%, and its emission spectrum is 500-700nm。 Peak 578nm。 The transition form of Eu3+ is 5D0-7F1, and the corresponding coordinates on the CIE chromaticity coordinates are x = 0。6672 and y = 0。3301。 The optimum concentration of Eu3 + was determined to be 3%。 When the UV light source is turned off, Li2MgSiO4: Tb3+ and Li2MgSiO4: Eu3+, the phosphor emits red light。 The thermoluminescence spectra show that the combination of electrons and holes in the valence band of  Li2MgSiO4: Tb3+ is the principle of light emission。 The luminescent properties of  Li2MgSiO4: Eu3+ system and Li2MgSiO4: Tb3+ system are related to the concentration of rare earth ions。 When the doping concentration is the best, the trap concentration is the largest and the luminescent brightness increases。

Key words: spectroscopy, thermoluminescence, doping concentration, sintering temperature

第一章 绪论 4

1。1引言 4

1。2 无机发光材料的发展历史 4

1。3常见的无机发光材料 5 稀土激发的锂镁硅酸盐光谱特性:http://www.youerw.com/cailiao/lunwen_92354.html