Er^(3+)/Yb^(3+)共掺纳米In_2O_3的制备及上转换发光  

Synthesis and Upconversion Luminescence of Er^(3+)/Yb^(3+) Co-doped In_2O_3 Nanocrystals

作　　者：邹少瑜[1] 孟建新[2] 

机构地区：[1]暨南大学化学系,广州510632 [2]暨南大学纳米化学研究所,广州510632

出　　处：《无机化学学报》2011年第6期1138-1142,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.30670523);中央高校基本科研业务费专项资金资助项目

摘　　要：用低温溶剂热法以乙二醇为溶剂合成了Er3+和Yb3+共掺的In2O3纳米晶。用X射线衍射(XRD)、透射电镜(TEM)、漫反射光谱和上转换发光光谱对样品进行了分析。XRD和TEM结果表明,产物为纯的立方相In2O3结构,粒径约为30 nm;漫反射光谱显示了In2O3∶Er3+,Yb3+纳米晶在522、653和975 nm附近有3个吸收带;在980 nm近红外光激发下,样品发射出中心波长为525及555 nm的绿光和662 nm的红光,分别对应于Er3+的2H11/2→4I15/2、4S3/2→4I15/2和4F9/2→4I15/2跃迁;研究了Er3+和Yb3+离子的不同掺杂浓度对发光强度的影响,确定了Yb3+和Er3+离子的最佳掺杂浓度均为3%;双对数曲线显示绿光和红光的发射过程均为双光子吸收过程,对样品的上转换发光机制进行了初步讨论。Nanocrystals of up-conversion phosphor Er^3＋ and Yb^3＋ co-doped In2O3 were prepared by solvent thermal method using glycol as solvent.The samples were characterized by X-ray diffraction,transmission electron microscopy,diffuse reflectance spectra,and upconversion luminescence spectra.X-ray diffraction analysis showed that the products were pure cubic phase,while transmission electron microscopy measurements confirmed the particles size was about 30nm.The diffuse reflectance spectra indicated that Er^3＋/Yb^3＋ co-doped In2O3 nanocrystals have three absorption bands around 522,653 and 975 nm.Under 980 nm excitation,the spectral peaks centered at 525,555,662 nm respectively,corresponding to ^2H11/2→^4I15/2,^4S3/2→^4I15/2 and ^4F9/2→^4I15/2 of Er^3＋ ions.The impact of different concentration of Er^3＋ and Yb^3＋ ions on the up-conversion luminescence intensity were discussed.When the doped concentration of Er^3＋ and Yb^3＋ ions are both 3%,the upconversion intensity got the most.The lgI-lgP curve shows that the green and red emissions are double-photon absorption process.And the upconversion mechanism and process of the samples were also analyzed.

关 键 词：溶剂热法 上转换 纳米晶 In2O3∶Er3+ Yb3+ 

分 类 号：O482.31[理学—固体物理] O614.344[理学—物理]