稀土掺杂对WLED用硼酸银玻璃发光的影响

发布时间：2018-02-04 14:21

本文关键词： Ag聚集体硼酸盐玻璃白光LED　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：近些年,稀土离子发光材料被广泛应用于新型照明、激光和显示材料等领域,并在其中占据着非常重要的地位。WLED作为第四代新型绿色照明光源,一方面可以提高照明质量,另一方面可以提高照明效率。越来越多的科研人员对稀土离子掺杂的发光材料展开了广泛的研究。为了探索采用玻璃荧光体实现白光LED的可能性,本实验分别制备了Sm~(3+)、Eu~(3+)、Nd~(3+)和Y~(3+)单掺的硼酸银玻璃材料,期望通过结合Sm~(3+)、Eu~(3+)和Nd~(3+)位于红橙光区域的红光发射和Ag聚集体位于蓝绿光区域的宽带发射来实现样品的全色发光。具体内容如下:(1)使用高温熔融淬火技术制备了不同浓度Sm~(3+)和Eu~(3+)掺杂的硼酸银玻璃样品,分别研究各组样品的吸收光谱和激发、发射光谱随浓度的变化,得到Ag多聚体在蓝绿光区域的宽带发射和Sm~(3+)及Eu~(3+)红橙光区域的特征发射。分别选各组分中发光最强的样品,测量其激发、发射谱,观察到激发峰和发射峰随监测波长和激发波长移动,由此得出了不同形式Ag聚集体的存在。研究样品的色坐标和色温,结果表明所设计的样品发光较强、呈现出暖白光,在白光LED领域具有较大的商用价值。(2)采用同样的方法制备了不同浓度Nd~(3+)掺杂的硼酸银玻璃材料,研究了这些样品的吸收光谱和荧光光谱,可以得出样品中Ag以聚集体的形式存在。选取发射光谱中发光最强样品,测量其激发谱和发射谱,可以观察到激发峰和发射峰随监测波长和激发波长的移动,讨论了Ag多聚体随激发波长的变化。研究了样品的色品坐标与色温值,得到了发光较强、发冷白光的玻璃,这对白光LED的研究具有一定的价值。(3)采用相同方法制备了不同浓度Y~(3+)掺杂的硼酸银玻璃样品。测量其吸收谱和465nm激发光下的发射谱,由此可以得出Ag聚集体的存在。将具有4f电子层的Sm~(3+)、Eu~(3+)、Nd~(3+)离子和不具有4f电子层的Y~(3+)掺杂硼酸银玻璃样品的光谱进行归一化比较,得到稀土离子的掺杂和Ag聚集体的聚集状态及分布形式都没有必然的联系,Ag聚集体的分布只和激发、监测波长有关,但稀土离子掺杂浓度会引起晶体场的变化,从而导致样品中Ag聚集体跃迁速率的变化。
[Abstract]:In recent years, rare earth ion luminescent materials have been widely used in new lighting, laser and display materials, and occupy a very important position. On the one hand, it can improve the lighting quality. On the other hand, it can improve lighting efficiency. More and more researchers have carried out extensive research on rare earth ion doped luminescent materials. In order to explore the possibility of using glass fluorescence to realize white LED. In this paper, we have prepared the mono-doped silver borate glass materials of Sm~(3, Euzia (3) and YTX (3), which are expected to be bonded with Sm~(3). Eu~(3) and Nd~(3) the red light emission in the red orange region and the broadband emission of Ag aggregates in the blue-green region to achieve the panchromatic luminescence of the sample. Silver borate glass samples with different concentrations of Sm~(3 and Eu~(3) were prepared by high temperature melt quenching. The absorption spectra, excitation spectra and emission spectra of each group were studied respectively with the change of concentration. The broad band emission of Ag polymer in the blue-green region and the characteristic emission in the region of Sm~(3) and Eu~(3) were obtained. The samples with the strongest luminescence were selected and the excitation and emission spectra were measured. It is observed that the excitation and emission peaks move with the monitoring and excitation wavelengths, and the existence of different Ag aggregates is obtained. The color coordinates and color temperatures of the samples are studied. The results show that the designed samples have strong luminescence. The silver borate glass doped with different concentrations of Nd~(3 was prepared by the same method. The absorption and fluorescence spectra of these samples were studied. The Ag in the sample was found to exist in the form of aggregates. The excitation and emission spectra were measured by selecting the most luminescent samples in the emission spectrum. The shift of excitation and emission peaks with monitoring wavelength and excitation wavelength was observed. The variation of Ag polymer with excitation wavelength was discussed. The color coordinate and color temperature of the sample were studied, and the strong luminescence was obtained. Cold, white glass. This method has certain value for the study of white light LED. Doped silver borate glass. Absorption spectra and emission spectra of 465 nm excited light were measured. Therefore, the existence of Ag aggregates can be obtained. The 4f electronic layer will be found in Sm~(3. The spectra of silver borate glass samples without 4f electron layer and Nd~(3 ion were normalized. It is found that the doping of rare earth ions and the aggregation state and distribution form of Ag aggregates are not necessarily related to the distribution of Ag aggregates only related to excitation and monitoring wavelength. However, the concentration of rare earth ions can cause the change of crystal field, which leads to the change of the transition rate of Ag aggregation in the sample.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ171.11;TN312.8

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