稀土铝酸锶夜光纤维的发光性质

 使用X射线衍射和荧光光谱对稀土铝酸锶夜光纤维的晶相结构及激发和发射光谱进行分析,同时测定不同激发照度和激发时间下夜光纤维的蓄发光规律。结果表明:夜光纤维中发光材料的晶体结构和光谱性质没有因纤维制作工艺而发生改变;夜光纤维发光源于铝酸锶材料中Eu2+离子的4f65d1→4f7跃迁,其主发射峰在520 nm可见光区;夜光纤维受光激发数十秒到2 min,发光照度达到饱和,其饱和值及达到饱和值的时间由激发光的强弱决定;夜光纤维余辉的衰减由快、慢2个过程组成,这是由材料内不同深度的缺陷能级造成。

Luminescence properties of rare-earth strontium aluminate luminescent fiber

The crystal phase structure of rare-earth strontium aluminate luminescent fiber was tested by XRD,and the spectroscopic properties were analyzed by fluorescence spectrophotometer.At the same time,the storage and luminescent rules at different exciting illuminances and exciting time were measured.The experimental results indicated that the crystal phase structure and spectroscopic properties of luminescent materials were not changed by the making process of fiber;the luminescence properties of luminescent fiber were originated from the 4f()~65d~1→4f()~7 transition of Eu~(2+);the illuminance intensity of luminescent fiber was saturated after about several seconds to two minutes of lighting,the saturation value and the time to reach this value were decided by the intensity of exciting light;afterglow decay was composed of rapid-decaying and slow-decaying processes,and this was caused by the different depths of defect energy level in the materials.