纳米晶ZnO:Dy^(3+)粉体的制备和发光性质  

Synthesis and Photoluminescence Properties of Dy-Doped ZnO Nanocrystals

作　　者：张琳丽[1] 郭常新[2] 

机构地区：[1]西安建筑科技大学物理系,西安710055 [2]中国科学技术大学物理系,合肥230026

出　　处：《Journal of Semiconductors》2007年第6期887-892,共6页半导体学报（英文版）

基　　金：国家自然科学基金(批准号:19874057);安徽省自然科学基金(批准号:01044904)资助项目~~

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：Dy^3＋ nanocrystals have been synthesized by solid state reaction. X-ray diffraction （XRD） ,transmission elec-tron 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 the PL of ZnO：Dy^3＋ nanocrystals, besides sharp lines from the 4f→4f transi-tion of Dy^3＋ ,two broad bands appear from the Dy defects A and B in ZnO,with peaks at 600 and 760nm and full widths at half maximum （FWHM） of about 200 and 100nm,respectively. Under the exciton excitation （385nm）, the intensity of the peak at 760nm is far stronger than that of the peak at 600nm. The relative intensity of each peak in the emission spectrum depends on the excitation wavelength and the concentration of the Dy^3＋ . Under the excited state of Dy^3＋ （454nm）, the emis-sion of broad bands with peaks at 600 and 760nm is lost. Only the 4f→4f transitions of Dy^3＋ remain.

关 键 词：ZnO:Dy 光致发光 固相反应法 

分 类 号：TN304.05[电子电信—物理电子学]