论文部分内容阅读
采用高温固相法制备了BaAl_2Si_2O_8∶Tb~(3+),Ce~(3+)系列的荧光材料,讨论了Tb~(3+),Ce~(3+)单掺及Tb~(3+),Ce~(3+)共掺样品的光谱性质及发光机理,分析了Ce~(3+)与Tb~(3+)之间的能量传递过程。通过对样品进行XRD,荧光光谱,色坐标等测试。结果表明,Tb~(3+),Ce~(3+)的掺杂没有改变BaAl_2Si_2O_8晶体的结构。BaAl_2Si_2O_8∶Tb~(3+)发出明亮的绿光,发光峰分别位于487,545,583和621nm对应于Tb~(3+)的5 D4→7 FJ(J=6,5,4,3)特征发射。Ce~(3+)的掺入没有改变BaAl_2Si_2O_8∶Tb~(3+)发射光谱的位置,但使其激发谱由窄带激发变成了宽带激发增加了谱带多样性,发光强度有了明显的增强,而且颜色也具有一定的协调性,使其在实际运用方面具有更大的灵活性。发光强度增强的原因不仅仅是因为Ce~(3+)的敏化作用,还与Ce~(3+)和Tb~(3+)之间存在能量传递有密切关系。通过猝灭法计算了,Ce~(3+)与Tb~(3+)之间的能量传递的临界距离为15.345nm,并且证明了能量传递是由偶极-偶极相互作用产生的。通过计算得到能量传递效率最高达到了76.04%。
The BaAl_2Si_2O_8: Tb ~ (3 +) and Ce ~ (3 +) series of fluorescent materials were prepared by high temperature solid state reaction. The effects of Tb 3+, Ce 3+ and Tb 3+ ) And Ce ~ (3+) codoped samples were investigated. The energy transfer between Ce 3+ and Tb 3+ was analyzed. Through the sample XRD, fluorescence spectra, color coordinates and other tests. The results show that the doping of Tb 3+ and Ce 3+ does not change the structure of BaAl 2 Si 2 O 8 crystals. BaAl_2Si_2O_8: Tb_ (3+) emits bright green light with emission peaks located at 487, 545, 583 and 621 nm respectively corresponding to 5 D4 → 7 FJ (J = 6,5,4,3) emission of Tb 3+. The incorporation of Ce 3+ did not change the emission spectrum of BaAl 2 Si 2 O 8: Tb 3+, but the excitation spectrum changed from narrow-band excitation to broad-band excitation and increased the spectral diversity. The luminescence intensity was significantly Enhanced, and the color also has a certain degree of coordination, so that it has greater flexibility in practical application. The enhancement of luminescence intensity is not only due to the sensitization of Ce 3+ but also to the energy transfer between Ce 3+ and Tb 3+. By the quenching method, the critical distance of energy transfer between Ce 3+ and Tb 3+ is 15.345 nm, and the energy transfer is proved by the dipole-dipole interaction. The calculated energy transfer efficiency reached 76.04%.