论文中文题名: | 铕掺杂铝酸锶基蓄光材料的高温固相合成研究 |
姓名: | |
学号: | 04082 |
保密级别: | 公开 |
学科代码: | 080502 |
学科名称: | 材料学 |
学生类型: | 硕士 |
院系: | |
专业: | |
研究方向: | 稀土功能材料 |
第一导师姓名: | |
论文外文题名: | Studies on Preparation of Europium Ion Adulterated Strontium Aluminate Phosphors by Solid Phase Method |
论文中文关键词: | |
论文外文关键词: | Strontium aluminate Long afterglow Preparation technology Phosphors |
论文中文摘要: |
铕离子掺杂的铝酸锶基蓄光材料余辉发光亮度高、余辉时间较长、性能稳定,在照明、标识及显示等领域具有很广泛的应用。
本论文采用高温固相合成法合成了蓄光性能良好的SrAl2O4基质蓄光材料,对产品的发光性能、形貌、物相组成等进行了测试与分析,研究了合成温度、保温时间、Eu2+离子的掺杂量、还原气氛、助熔剂等因素对SrAl2O4:Eu2+蓄光材料蓄光性能的影响。
以碳酸锶、氧化铝、氧化铕为主要原料,硼酸为助熔剂,优化的最佳配方为nSrCO3:nAl2O3: nEu2O3:nH3BO3:nC=1:0.85:0.02:0.3:1;制备的最佳工艺条件:烧结温度为1300℃,选择粉末活性炭提供还原气氛,保温3小时,随炉冷却后取样。研究发现合成温度高,产品的发光效果好,但物相组成也较复杂;Eu2+离子在一定掺杂量范围内,产品的发光亮度先是出现一个提高过程,然后逐渐降低,结果表明Eu2+离子掺杂量为0.02(nEu2O3:nSrCO3)时合成样品的性能最好;保温时间过长,产品几乎不发光,保温时间较短,产品发光效果又不好,研究表明保温时间为3小时比较有利于合成发光效果好的产品;助熔剂对产品的合成温度和发光性能都有影响,助熔剂的加入量较低时,主要表现为助熔作用,对发光性能影响不大,助熔剂的加入量较高时,使得产品发光亮度降低和余辉时间缩短,当助熔剂的加入量为0.3(nH3BO3:nSrCO3)时,产品发光亮度和余辉时间最为理想,并达到了降低SrAl2O4基质发光材料合成温度的预期研究目的;还原气氛的不同,对产品的发光性能也存在一定差异。
对产品的性能评价表明,铝酸锶基蓄光材料的耐紫外辐照、化学稳定性良好,不同气温对铝酸锶基蓄光材料的性能基本没有影响,在紫外灯照射激发下其发光性能良好。本实验所制备的SrAl2O4:Eu2+蓄光材料与资料报道的相比,具有结晶度好、耐光性优良,在不同气候条件下热稳定性良好等优点。
﹀
|
论文外文摘要: |
Eu2+ ion activated strontium aluminate phosphors are a kind of photoluminescent materials with high brilliance,long afterglow and stable performance. They are widely used in meet emergency illumination,identification marks,display and so on.
In this paper,by the study of synthesizing process,the SrAl2O4:Eu2+ phosphors were systhesized at optimized craft condition and proportion by means of solid phase method.We researched the influences of systhesis temperature,heat preservation time,Eu2+ concentration,reduction surrounding feeling and flux on luminescent properties of SrAl2O4:Eu2+ phosphors,optimized the experiment conditions and reduced systhesis temperature.
We found that the systhesized sample’s optimal mixture ratio is nSrCO3:nAl2O3: nEu2O3:nH3BO3:nC=1:0.85:0.02:0.3:1,luminescent brightness is better with increasing systhesis temperature,but the phase component is more complex. We found that the luminescence brightness of sample appear a increasing process at first,and then a reducing one with the raise of Eu2+ concentration,it indicated that the luminescence brightness is not better if the Eu2+ concentration is too high or low. We found that the synthesized sample can not bright at too long heat preservation time,and the luminescence brightness is lower at too short heat preservation time. We found that the content of flux have effect on the systhesis temperature and luminescent properties.
Carried on the evaluation to the sample performance,we have discovered the uviolresistance stability is good. We found that the sample’s luminescent brightness is almost constant under different air temperature,and its afterglow is good in the ultraviolet light irradiation. Comparing reported data,we found that the sample’s crystallinity is better, light-fast performance become stronger and thermostability is better at different temperature.
﹀
|
中图分类号: | TB321 |
开放日期: | 2008-04-28 |