长余辉发光材料的紫外-可见反射光谱测定

Determination of UV-Vis Reflective Spectra of Long After-glow Phosphorescent Material

用“湿法”制备了长余辉发光材料 ,原料通过水溶液液相分子水平上的均匀混合 ,利用金属硝酸盐和有机还原剂在较低的温度下发生氧化还原燃烧反应 ,一步快速生成产品。加热起燃温度低至 5 0 0℃ ,反应时间短 ,所制得的产品成份均匀 ,晶粒小 ,外观呈蓬松状态 ,易研磨粉碎 ,粉体表观密度小。以紫外 可见分光光度计测定分析了所制备样品在蓄光前后的反射光谱特征并作了探讨。结果表明 ,除表观密度外 ,“湿法”与“干法”制备的长余辉发光材料的主要性质相同 ,紫外 可见反射光谱可以准确描述长余辉发光材料的紫外 可见光谱性能特征。

The long after-glow phosphorescent materials were fabricated by using 'wet' method. The component materials were dissolved in water solution so that their homogeneous mix was reached at molecular level. The approach that metal nitrates and organic reductants, would react spontaneously and get into combustion at a moderately low ambient temperature through oxido-reduction reaction was introduced into our fabrication of long after-glow phosphorescent samples. The ambient temperature to generate the combustion could go down to 500degreesC, and the reaction completed within 1-2 minutes, producing a fluffy resultant with small crystal structure and even composition, which is easy to grind, and with low bulk density for its powder. UV-Vis reflective spectrophotometer was used to determine and analyze the characteristics of the sample before and after its absorption of light. The result shows that the properties of the samples fabricated from both 'wet' and 'dry' techniques are similar except their bulk densities, and the UV-Vis reflective spectrum was able to clearly describe the spectral characteristics of long after-glow phosphorescent materials.