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硅酸铋是性能良好的基质材料，以其为原料生长的硅酸铋单晶是一种性能优异的闪烁晶体，在核医学以及高能物理等前沿科学领域都有诸多应用。Bi4Si3O12：Er3+具有优异的化学稳定性，有望成为一种主要的发光材料。本文采用了共沉淀法进行制备 BSO粉体，而后烧结到1000℃， 通过控制其降温速度得到 BSO玻璃并且用XRD 检测其是否为玻璃态。在制得玻璃态样品之后，通过测试样品的吸收谱和荧光光谱来测试其发光性能：掺杂铒的量为 1%的硅酸铋玻璃样品的主峰位于 1461nm，次峰位于 982nm 和 786nm。Er3+离子
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BSO 玻璃样品在室温测试时共有 10 个吸收谱带被探测到。分别对应 4I15/2 基态能级到I13/2激发态能级的吸收跃迁。其中跃迁：4I15/2→4G11/2和4I15/2→2H11/2，属于超敏跃迁。4I15/2→4S3/2跃迁与4I15/2→2H11/2跃迁相交叠而难以分辨。BSO玻璃的室温荧光光谱。最强的发射峰位于 1530nm附近，对应于 Er3+离子的 4I13/2→4I15/2能级跃迁。BSO 玻璃以 980 nm 激发的室温上转换荧光光谱。基态的Er3+离子吸收 980 nm泵浦光的能量跃迁至激发态，经一系列的能量变化最终发射出645 ~ 680 nm的红光。21655
毕业论文关键词：Er:Bi4Si3O12；玻璃 ；共沉淀法； 发光特性；
Abstract:
As a basic material, BSO has good performance. The BSO crystal is a kind of excellent
scintillation crystal which is made from BSO powder and it has many applications in nuclear
medical and high-energy physics. Bi4Si3O12:Er
3+
has dramatic chemical stability which is been
expected to become a main light-emitting materials .The BSO was made by co precipitation
method and then raise temperature to 1000℃ and The BSO powder will become to BSO
glasses by controlling the speed of cooling down the temperature . We XRD to make sure it
are the glasses .Next step we make its luminescence properties clear by testing the absorption
spectrum and fluorescence spectrum. We find out the sample of 1% Er
3+
in the glass has its
absorption peak at 1487nm. And its second peaks at 982nm.when we test the sample at 26 ℃
there are 10 bands were detected which is corresponding from ground state
H11/2 belongs to the hypersensitive transition.
And the
H is too close to distinguish them. We also test the fluorescence spectra at 26℃ : The strongest emission is near 1530 nm correspond to the
transition
4
I13/2→4
I15/2 of Er
3+
.we use laser to excite the BSO to get to temperature fluorescence
spectra.Er
3+
ground state energy absorption transition of 980nm pump light to the excited state.
A series of energy changing and then it fires 645 ~ 680 nm red light.
Key Words：Er:Bi4Si3O12; glasses; co precipitation method; characteristics of luminescence
目录
摘要 ................................................................................................................................... 1
Abstract: ................................................................................................................................ 1
1. 文献综述 .................................................................................................................. 4
1.1. 选题的科学意义和依据 ................................................................................... 4
1.1.1. 发光材料的历史 ........................................................................................ 4
1.1.2. 上转换发光现象 ........................................................................................ 5
1.2. Er离子的电子结构及发光特点 ...................................................................... 6
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