摘要
通过溶胶-凝胶技术制备了以稀土离子Eu3+为激活剂的硅基发光材料,并考察了Na2WO4的掺杂对体系发光性能的影响。主要通过研究三维荧光光谱,荧光激发光谱和发射光谱,分析探讨了Na2WO4的掺入对发光中心Eu3+发光性质的影响,结果发现,三维荧光光谱高斯图像充分表明了Na2WO4的掺杂有效地提高了Eu3+的5D0→7F2特征跃迁。用荧光激发光谱图和发射光谱图进一步详细的表征了基质和Eu3+的f→f跃迁及其强度变化情况。通过能级图、位形坐标图和敏化过程示意图等理论对这个影响的原因进行了进一步的说明和探讨。结果表明,O→W的电荷迁移带吸收了大量的能量,并有效地将能量传递给Eu3+,促使发光中心的发光强度增大。但由于Na2WO4的掺杂还增加了硅基质的能量吸收而使整体材料的发光效率下降。
Silica luminescence materials were prepared by sol-gel method with rare ion Eu3＋ as activator.The effects of doping Na2WO4 on luminescence properties were investigated.The luminescence properties of the material were measured by the three dimensional fluorescence,emission and excitation spectra.The doping of Na2WO4 improved the 5D0→7F2 characteristic transitions of Eu3＋ remarkably,while the emission and excitation spectra showed the every detailed f→f transitions of matrix and Eu3＋ ion,and variation of intensity.The energy transfer during the activator and WO2-4 were explained by level chart,configuration coordinate diagram and sensitization effect diagram,respectively.The results illustrated that O→W charge transfer state absorbed the large amount of energy,which was transfered to activator Eu3＋ effectively,and made the luminescence intensity increase of Eu3＋.However,the doping of Na2WO4 not only absorb more energy but also invite the silica matrix to get more energy from the exciter,which cause the decrease of luminescence efficiency.
出处
《光谱实验室》
CAS
CSCD
北大核心
2011年第5期2357-2361,共5页
Chinese Journal of Spectroscopy Laboratory
关键词
溶胶-凝胶法
发光性能
能量传递
Sol-Gel Method
Luminescence Properties
Energy Transfer
