不同激发波长对Sr_3Al_2O_6∶Eu^(2+),Dy^(3+)红色长余辉发光材料发射光谱的影响  

Effect of Different Excitation Monitoring Wavelengths on Emission Spectrum of Red Long Afterglow Phosphor Sr_3Al_2O_6∶Eu^(2+),Dy^(3+)

作　　者：崔彩娥[1] 李健[1] 黄平[1] 梁丽萍[1] 武银兰[1] 

机构地区：[1]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《光谱学与光谱分析》2012年第1期65-68,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(51072128)资助

摘　　要：采用高温固相法合成了Sr3Al2O6∶Eu2+,Dy3+长余辉发光材料。用X射线衍射仪及荧光分光光度计对材料物相及光谱性能进行了分析。结果表明:所得样品为Sr3Al2O6的纯相,在360nm波长的激发下,得到波峰为537nm的宽带发射光谱;在468nm波长的激发下,得到波峰为590nm的宽带发射光谱;在波长为394nm的激发下,537和590nm的峰同时出现。根据晶格场效应和电子云膨胀效应,对不同激发波长对Sr3Al2O6∶Eu2+,Dy3+发射光谱的影响进行了解释。结果表明:在Sr3Al2O6∶Eu2+,Dy3+中发光中心因其5d能级劈裂幅度不同及4f65d1能带重心不同而导致发光颜色的不同。The Eu2＋ and Dy3＋ ion co-doped Sr 3Al2O6 phosphor powders with long afterglow were prepared with high temperat ure solid-state reaction.The phase and the spectra properties of the material were characterized by X-ray diffraction（XRD） and fluorescence spectrophotomete r.It was found that the sample is composed of pure Sr3Al2O6 phase.Furthe rmore,the emission peak of 537 nm under 360 nm excitation and that of 590 nm ex cited by 468 nm-light were obtained,respectively,and it is more interesting t hat the emission peaks were at 537 and 590 nm under 394 nm excitation.The ef fects of different excitation wavelengths on the emission spectrum were explaine d reasonably by the effect o f nephelauxetic effect and crystal field.It revealed that the two types of lumi nescence with different color were caused by the differences of the center of gr avity of the 5d excited state energy level and the split range of 5d ene rgy level.

关 键 词：长余辉发光 Sr3Al2O6 晶格场效应 电子云膨胀效应 

分 类 号：O482.3[理学—固体物理]