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研究了SrAl2O4∶Eu2+,Dy3+长余辉材料在模拟潮湿环境条件下的稳定性。采用了2种模拟环境方法对样品进行了预处理。第1种方法为样品于室温条件下在去离子水中浸泡3d;第2种方法为样品在70℃的水中浸泡10h,或者经过人工加速老化试验制备产物。结果显示:第1种方法的预处理产物没有发生明显的分解,然而与未经处理的样品比较,发现其发光强度和发射光谱的峰值位置都发生了变化。而通过第2种预处理方法得到的产物发生了明显的分解分层。将溶液过滤蒸干得到两层的粉末状固体,分别记作上层产物和下层产物。通过X射线衍射和X射线能谱分析产物晶体结构,上层产物是Sr3Al2(OH)12,下层产物是Sr3Al2(OH)12和SrAl3O5(OH)的混合物。下层产物具有长余辉特性,为SrAl3O5(OH)∶Eu2+,Dy3+发光,发射光谱峰值位于485nm,而原样品SrAl2O4∶Eu2+,Dy3+的发射光谱峰值为520nm。实验结果表明SrAl2O4∶Eu2+,Dy3+长余辉材料在高温或潮湿条件中应用时,需要进行包膜处理。
The stability of SrAl2O4:Eu2 +, Dy3 + long afterglow materials under simulated wet conditions was studied. Two simulation environment methods were used to pretreat samples. The first method is that the sample is immersed in deionized water for 3 days at room temperature; the second method is that the sample is soaked in water at 70 ° C for 10 hours or subjected to artificial accelerated aging test to prepare the product. The results showed that the pretreatment products of the first method did not decompose obviously. However, compared with the untreated samples, the emission intensity and the peak position of the emission spectrum were changed. However, the product obtained by the second pretreatment method was obviously decomposed and stratified. The solution was filtered and evaporated to dryness to give two layers of powdery solid which were recorded as the upper product and the lower product, respectively. The crystal structure of the product was analyzed by X-ray diffraction and X-ray spectroscopy. The upper product was Sr3Al2 (OH) 12 and the lower product was a mixture of Sr3Al2 (OH) 12 and SrAl3O5 (OH). The SrO3O5 (OH): Eu2 +, Dy3 + emits light with the emission peak at 485nm. The emission peak of SrAl2O4: Eu2 + and Dy3 + is 520nm. The experimental results show that the SrAl2O4: Eu2 +, Dy3 + long afterglow material in the high temperature or humid conditions, the application needs to be coated.