摘要
选择NaGdF_(4)作为基质材料,以Er^(3+)、Yb^(3+)为掺杂元素,采用水热法制备出了Er^(3+)/Yb^(3+)掺杂的NaGdF_(4)下转换发光材料,通过XRD、SEM、发射光谱、荧光衰减分析等对其进行了表征。结果表明,Er^(3+)/Yb^(3+)的掺杂没有改变NaGdF_(4)的晶格结构,未生成新的产物,样品具有较好的纯度,平均粒径尺寸在50~60 nm之间。以380 nm激发光照射样品,发射光谱出现了699,662,563和554 nm的发射峰,分别对应着Er^(3+)离子的^(4)I_(9/2)→^(4)I_(15/2)、^(4)F_(9/2)→^(4)I_(15/2)、^(4)S_(3/2)→^(4)I_(15/2)和^(2)H_(11/2)→^(4)I_(15/2)能级跃迁。随着Yb^(3+)掺杂浓度的增加,近红外光区的发光强度呈先上升后下降趋势,CIE色坐标表明样品的颜色由黄绿光区逐渐向蓝紫光区转变,当n(Er^(3+))∶n(Yb^(3+))=2∶2时,NaGdF_(4)发光材料在可见光区域的发射光谱强度最高。能量传递效率和量子效率随Yb^(3+)浓度的增加而不断增大,当Yb^(3+)的浓度达到6%(摩尔分数)时,样品寿命最低为7.70μs,该掺杂浓度下的NaGdF_(4)具有最高的能量传递效率和量子效率,分别为81.19%和181.19%。
NaGdF_(4) was selected as the matrix material,and Er^(3+)and Yb^(3+)were used as doping elements,Er^(3+)/Yb^(3+)doped NaGdF_(4) down-conversion luminescent materials were prepared by hydrothermal method,and characterized by XRD,SEM,emission spectroscopy,fluorescence attenuation analysis,etc.The results showed that the doping of Er^(3+)/Yb^(3+)didn’t change the lattice structure of NaGdF_(4),and no new products were generated.The sample had good purity,with an average particle size between 50 and 60 nm.The sample was irradiated with 380 nm excitation light,and the emission spectra showed emission peaks of 699,662,563 and 554 nm,corresponding to the ^(4)I_(9/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2),^(4)S_(3/2)→^(4)I_(15/2) and ^(2)H_(11/2)→^(4)I_(15/2) energy level transitions of Er^(3+)ions,respectively.With the increase of Yb^(3+)doping concentration,the luminescence intensity in the near-infrared region showed a trend of first increasing and then decreasing.The CIE color coordinate indicated that the color of the sample gradually transitions from the yellow green region to the blue purple region.When n(Er^(3+))∶n(Yb^(3+))=2∶2,the emission spectral intensity of NaGdF_(4) luminescent material was the highest in the visible light region.The energy transfer efficiency and quantum efficiency continuously increased with the increased of Yb^(3+)concentration.When the concentration of Yb^(3+)reached 6 mol%,the minimum sample lifetime was 7.70μs.At this doping concentration,NaGdF_(4) had the highest energy transfer efficiency and quantum efficiency,which were 81.19%and 181.19%,respectively.
作者
季喜燕
杨坤
JI Xiyan;YANG Kun(Chemistry Department of Baotou Teachers College,Baotou 014030,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第11期11090-11095,共6页
Journal of Functional Materials
基金
国家自然科学基金项目(51560319)
包头师范学院校级项目(BSJG24Y18)。
