Ce^(3+)掺杂对GdAl_3(BO_3)_4:Dy^(3+)和GdAl_3(BO_3)_4:Tb^(3+)荧光粉发光性能的影响(英文)

Influence of Ce^(3+) Ions on the Photoluminescence Properties of Dy^(3+) or Tb^(3+) Doped GdAl_3(BO_3)_4 Phosphors

用湿化学方法合成了Ce3+/Dy3+及Ce3+/Tb3+共掺GdAl3(BO3)4发光材料。利用X射线衍射仪对其进行了物相分析,结果表明:合成物为纯的六方相GdAl3(BO3)4微晶。利用荧光分光光谱仪进行光谱分析,测定了合成样品的激发和发射光谱。发现在紫外激发下,GdAl3(BO3)4:Dy荧光粉发射出很强的偏黄的白光,其发射峰分别位于480,575和665nm,对应于Dy3+的4F9/2→6H15/2,13/2,11/2跃迁。掺Ce3+对Dy3+起到敏化作用,GdAl3(BO3)4:Dy,Ce发出很亮的暖白光,且强度是GdAl3(BO3)4:Dy的3倍左右。同时,在Ce3+/Tb3+共掺的样品中,由于Ce3+与Tb3+间的能量传递,Tb3+的541nm特征峰显著增强。

Ce3＋/Dy3＋ and/or Ce3＋/Tb3＋ codoped GdAl3（BO3）4 phosphors were synthesised by a wet-chemical method. The phosphors were characterized by X-ray diffraction and fluorescence measurements. The GdAl3（BO3）4：Dy phosphors show intense emissions centred at 480, 575, and 665 nm upon excitation by ultraviolet-blue light, which are associated with the typical transitions of 4F9/2→ 6H15/2, 4F9/2→6H13/2, and 4F9/2→ 6H11/2 of Dy3＋, respectively. The presence of Ce3＋ resulted in an enhancement of Dy3＋ emission intensity by a factor of -3. The characteristic green emission at 541 nm of Tb3＋ doped GdAl3（BO3）4 has been significantly enhanced with Ce3＋ doping, confirming that energy transfer from Ce3＋ to Tb3＋ happens in the compounds.