Eu^(3+)对Na_3Gd_2(BO_3)_3∶Tb^(3+)发光性能的影响及其能量传递  

Influence of Eu^(3+) Doping on Luminescence Properties of Na_3Gd_2(BO_3)_3∶Tb^(3+) and the Relevant Energy Transfer Mechanism

作　　者：任强[1] 魏腾跃 武秀兰[1] 霍哲哲 王保兴[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《材料导报》2017年第6期7-10,28,共5页Materials Reports

基　　金：陕西省科技统筹创新工程计划项目(2013KTDZ03-02-01);陕西科技大学研究生创新基金

摘　　要：采用高温固相法制备了Na_3Gd_2(BO_3)_3∶Tb^(3+),Eu^(3+)荧光粉,并对样品的物相组成、微观形貌、发光性能和能量传递进行了分析。结果表明,Na_3Gd_(2-x)(BO_3)_3∶xTb^(3+)荧光粉在紫外和近紫外区域有较强的激发峰,在368nm波长激发下,发射光呈绿色,Tb^(3+)最佳掺杂量为x=0.04。随着在Na_3Gd_(1.96)(BO_3)_3∶0.04Tb^(3+)中掺入Eu^(3+),Tb^(3+)对Eu^(3+)产生了以电偶极-电偶极相互作用为主的能量传递,且传递效率随Eu^(3+)掺杂量的增加而逐渐增大。发射光谱中Tb^(3+)的发射峰强度逐渐减弱,而Eu^(3+)的发射峰强度逐渐增强,导致Na_3Gd_(1.96-y)(BO_3)_3∶0.04Tb^(3+),yEu^(3+)荧光粉发光颜色由绿色向橙色变化。Na3Gd（2-x-y）（BO3）3∶ xTb^3＋,yEu^3＋phosphors were prepared by a high-temperature solid state reaction method.The phase composition,morphology,luminescence properties and energy transition of the phosphors were analyzed.The results show that the Na3Gd（2-x）（BO3）3∶xTb^3＋phosphors can be efficiently stimulated by UV and near-UV light.Under 368 nm excitation,the best doping amount of Tb^3＋is x=0.04 and the emission light is green.With the doping of Eu^3＋in Na3Gd（1.96）（BO3）3∶0.04Tb^3＋,Tb^3＋acts as an efficient sensitizer,which could enhance the emission intensity of Eu^3＋by transferring absorbed excitation energy through dipole-dipole interaction mechanism.The energy transfer efficiency increases with the increase of the Eu^3＋.The emission intensity of Eu^3＋increases and the emission intensity of Tb^3＋decreases,leading to the multi-color emission tunability of Na3Gd（1.96-y）-（BO3）3∶0.04Tb^3＋,yEu^3＋phosphors,and the emission color varies from green to orange.

关 键 词：荧光粉 Na3Gd2(BO3)3:Tb^3+ EU^3+ 发光颜色 能量传递 

分 类 号：TB34[一般工业技术—材料科学与工程] O482[理学—固体物理]