硅酸盐长余辉发光材料的制备及其性能研究
摘要
本文综述了长余辉材料的发展、现状,着重阐述了稀土掺杂硅酸盐长余辉发光材料的发展、现状、发光特性、制备方法和应用前景。以硅酸盐为基质的发光材料不仅有良好的化学稳定性和热稳定性,而且二氧化硅原料价廉、易得,烧结温度比铝酸盐体系低,因而具有广阔的应用前景。
本论文选择Sr2MgSi2O7:Eu,Dy长余辉材料为制备和研究对象。采用微波辐射法,在活性碳提供的还原气氛下制备出Sr2MgSi2O7基长余辉发光材料,实验中所用的微波炉为家用型微波炉。通过改进以前研究者所用的盛料系统,提高了该系统的密封性和保温性,在不使用微波吸波剂的情况下,有效地缩短了反应时间并保护了炉体。
借助X射线粉末衍射(XRD)、荧光光谱(PL)和亮度计等测试手段,对影响材料发光性能的因素进行了研究,确定了微波辐射法合成该材料的最佳条件,并与高温固相法进行了对比。该法制备出的发光粉在激发停止15s时余辉亮度为3760mcd/m2,余辉时间达17h。
采用溶胶-凝胶法,在1100℃左右的温度下,合成了Sr2MgSi2O7:Eu2+,Dy3+长余辉材料,比较了该方法与高温固相法获得的长余辉粉体的光致发光行为和长余辉性能。高温固相法合成的粉体的余辉性能高于溶胶-凝胶法得到粉体,其原因在于高温固相合成在基质内部产生了更高浓度的电子陷进。
In this paper, the current situation, development, characteristic of phosphors, preparation and application prospect of phosphorescence system of silicate were summarized. Eu2+ actived silicate phosphor, made by cheap and abundant raw material SiO2, has more chemical and thermal stability, lower sintering temperature and better consistent to ceramics than Aluminate phosphor. It is doomed to have wide application in the near future.
The paper have researched detailedly the system of Sr2MgSi2O7:Eu,Dy phosphor. The long afterglow luminescent materials of Sr2MgSi2O7 were firstly prepared by microwave irradiation method under the reductive atmosphere with absorbent charcoal. The oven used in the experiment is domestic microwave oven. The holder system made by previous researchers was modified, and it’s airproof and heat preservation performances were improved. The reaction time was notably shortened even without using the microwave absorber reagent, and the harm to oven by high temperature was avoided.
With XRD、PL and brightness meter, the luminescent properties and the factors which impact them were studied, and the optimum condition of sintering was determined, and compared them with high temperature solid state method. The luminescent intensity of phosphor powder synthesized by this method is 3760mcd/m2 at 15s after being excited, and the decay time of the sample is 17h. A phosphor of Sr2MgSi2O7:Eu2+,Dy3+ was synthesized by sol-gel method at the temperature 1100℃. The phosphor synthesized by solid reaction exhibited a better afterglow character than the phosphor obtained by the sol-gel method, due to a higher trap concentration which was formed by a higher reaction temperature.
本论文选择Sr2MgSi2O7:Eu,Dy长余辉材料为制备和研究对象。采用微波辐射法,在活性碳提供的还原气氛下制备出Sr2MgSi2O7基长余辉发光材料,实验中所用的微波炉为家用型微波炉。通过改进以前研究者所用的盛料系统,提高了该系统的密封性和保温性,在不使用微波吸波剂的情况下,有效地缩短了反应时间并保护了炉体。
借助X射线粉末衍射(XRD)、荧光光谱(PL)和亮度计等测试手段,对影响材料发光性能的因素进行了研究,确定了微波辐射法合成该材料的最佳条件,并与高温固相法进行了对比。该法制备出的发光粉在激发停止15s时余辉亮度为3760mcd/m2,余辉时间达17h。
采用溶胶-凝胶法,在1100℃左右的温度下,合成了Sr2MgSi2O7:Eu2+,Dy3+长余辉材料,比较了该方法与高温固相法获得的长余辉粉体的光致发光行为和长余辉性能。高温固相法合成的粉体的余辉性能高于溶胶-凝胶法得到粉体,其原因在于高温固相合成在基质内部产生了更高浓度的电子陷进。
In this paper, the current situation, development, characteristic of phosphors, preparation and application prospect of phosphorescence system of silicate were summarized. Eu2+ actived silicate phosphor, made by cheap and abundant raw material SiO2, has more chemical and thermal stability, lower sintering temperature and better consistent to ceramics than Aluminate phosphor. It is doomed to have wide application in the near future.
The paper have researched detailedly the system of Sr2MgSi2O7:Eu,Dy phosphor. The long afterglow luminescent materials of Sr2MgSi2O7 were firstly prepared by microwave irradiation method under the reductive atmosphere with absorbent charcoal. The oven used in the experiment is domestic microwave oven. The holder system made by previous researchers was modified, and it’s airproof and heat preservation performances were improved. The reaction time was notably shortened even without using the microwave absorber reagent, and the harm to oven by high temperature was avoided.
With XRD、PL and brightness meter, the luminescent properties and the factors which impact them were studied, and the optimum condition of sintering was determined, and compared them with high temperature solid state method. The luminescent intensity of phosphor powder synthesized by this method is 3760mcd/m2 at 15s after being excited, and the decay time of the sample is 17h. A phosphor of Sr2MgSi2O7:Eu2+,Dy3+ was synthesized by sol-gel method at the temperature 1100℃. The phosphor synthesized by solid reaction exhibited a better afterglow character than the phosphor obtained by the sol-gel method, due to a higher trap concentration which was formed by a higher reaction temperature.
引文
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