980nm激发下Ho^(3+)/Yb^(3+)共掺杂ZrO_2-ZnO粉末的上转换发光特性  

The Upconversion Luminescence Characteristics of Ho^(3+)/Yb^(3+) Codoped ZrO_2-ZnO

作　　者：张向华[1] 杨四秧[1] 丁庆磊[2] 刘政威[2] 

机构地区：[1]湖南工程学院电气与信息工程系,湖南湘潭411101 [2]湘潭大学材料与光电物理学院,湖南湘潭411105

出　　处：《光谱学与光谱分析》2010年第6期1456-1459,共4页Spectroscopy and Spectral Analysis

基　　金：国家(863计划)项目(2002AA324030)资助

摘　　要：通过固相反应法制备了Ho3+/Yb3+共掺杂ZrO2-ZnO粉末样品,重点报道了Ho3+/Yb3+共掺杂ZrO2-ZnO粉末样品在980nm激发下的上转换发光现象。在常温下测试得到的发射光谱显示3个发射峰,中心波长依次为540,671和762nm,分别对应Ho3+的5S2/5F4→5I8,5F5→5I8,5S2/5F4→5I7或5I4→5I8跃迁过程。稀土离子的掺杂浓度明显影响样品的上转换发光特性,当Ho3+浓度确定的情况下,随着Yb3+含量增大,红光强度和绿光强度先减小后增大,近红外光却先增大后减小,而绿光强度与红光强度的比值一直减小。当Yb2O3含量为4.7mol%时,随着Ho3+含量增大,各波段荧光强度均减小,而绿光强度与红光强度的比值基本不变。双对数曲线显示3个波长的上转换发光的发射过程均为双光子过程,对样品的上转换发光机制做了详细的说明。XRD显示样品的均匀性良好。Samples of Ho^3＋/Yb^3＋ codoped ZrO2-ZnO powder were prepared by a solid-state reaction.Upconversion luminescence of Ho^3＋/Yb^3＋ codoped ZrO2-ZnO powders was reported in the present paper.The excitation spectrum detected at room temperature suggests three excitation peaks centered at 540,671 and 762 nm respectively,corresponding to 5S2/5F4→5I8,5F5→5I8,and 5S2/5F4→5I7 or 5I4→5I8 of Ho^3＋ ions.The contents of rare-earth ions could influence the property of upconversion lumunescence.When the Ho^3＋ content was 0.1 mol%,with the increase in Yb^3＋ content,the intensity of red luminescence and green luminescence decreased first and then increased,but the intensity of infrared luminescence increased first and then decreased.Furthermore,the ratio of the intensity of green emission to red emission decreased.When the Yb^3＋ content was 4.7 mol%,with the increase in Ho^3＋ content,the intensity of all emission decreased,but the ratio of the intensity of green emission to red emission was almost constant.The logI-logP curve shows that all the upconversion luminescence is double-photon processes.And the upconversion mechanisms of the samples were introduced.It is shown from the XRD spectrum that the powder of samples is uniform.

关 键 词：上转换 Ho^3+/Yb^3+ 荧光 ZrO_2-ZnO 

分 类 号：O482.3[理学—固体物理]