纳米晶ZnO:Dy~(3+)粉体的制备和发光性质

编号：NMJS00050

篇名：纳米晶ZnO:Dy~(3+)粉体的制备和发光性质

作者：张琳丽; 郭常新;

关键词：ZnO:Dy; 光致发光; 固相反应法;

机构： 西安建筑科技大学物理系; 中国科学技术大学物理系 西安;

摘要： 通过固相反应法制备了ZnO:Dy3+纳米粉末,样品的X射线衍射、透射电镜和选区电子衍射证实了ZnO:Dy3+纳米粉末属于六方纤锌矿多晶结构.研究了光致发光谱与激发波长和掺杂离子浓度的依赖关系.结果表明,从ZnO:Dy3+纳米粉末的光致发光光谱中首次发现除了Dy3+的4f→4f跃迁外,出现了Dy掺入ZnO后产生的两个缺陷A和B的宽谱带发射峰,峰值分别在600和760nm,半高宽分别约为200和100nm.在ZnO的激子激发下(385nm),峰值760nm的发光强度远远大于峰值在600nm的发光强度.样品的发射光谱中峰值的相对强度变化依赖于激发波长和Dy3+的掺杂浓度.当在Dy3+4f→4f激发下(454nm),光谱中只有Dy3+的4f态间的特征发射,而缺陷A,B不发光. ZnO:Dy3+ nanocrystals have been synthesized by solid state reaction.X-ray diffraction(XRD),transmission electron microscopy(TEM),and selected area electronic diffraction(SAED)demonstrate that the nanocrystals can be indexed as hexagonal wurtzite polycrystalline.The photoluminescence spectra(PL)and photoluminescence excitation spectra(PLE)of the nanocrystals were measured at room temperature.The grain size of the nanocrystals is about 50nm as calculated using the Debye-Scherrer formula.We have found that in ...