CaLuBO4∶Tb^3+荧光粉的制备及发光性质

采用高温固相反应法合成了不同Tb^3+掺杂浓度的CaLuBO4∶xTb^3+荧光粉,研究了样品的晶体结构和发光性质。在紫外光激发下,样品的发射光谱由Tb3+离子的5D3→7FJ(J=6,5,4)和5D4→7FJ′(J′=6,5,4,3)特征发射组成,其中位于545 nm和554 nm附近的5D4→7F5跃迁发射强度最大。荧光粉的激发光谱是由位于紫外区的Tb3+的4f-5d和f-f跃迁构成的。研究了Tb3+浓度对样品发光性质的影响。测量并分析了CaLuBO4∶xTb^3+荧光粉的5D3能级和5D4能级荧光寿命。结果表明,CaLuBO4∶xTb^3+是一种适于紫外激发的新型黄绿光荧光粉。

Preparation and Photoluminescence Properties of CaLuBO4∶Tb^3+Phosphor

The phosphors CaLuBO4∶xTb^3+were synthesized through the solid-state reaction technique.The structure,photoluminescence properties of these phosphors were described.Upon excitation with UV light excitation,the photoluminescence emission spectra could be assigned to the transitions of Tb^3+from 5D3→7FJ(J=6,5,4)and 5D4→7FJ′(J′=6,5,4,3).The two strong emissions peaked at 545 nm and 554 nm,which arose from the 5D4-7F5 of Tb^3+,respectively.The photoluminescence excitation spectra show a broad 4f-5d band and f-f transitions in UV region.The dependence of photoluminescence intensities on Tb^3+concentration was studied.The luminescence lifetimes of 5D3 and 5D4 energy level were measured and analysed,respectively.The CaLuBO4∶xTb^3+phosphor is a novel yellow-green emitting phosphor suitable for ultraviolet light excitation.