可调色荧光粉LaSrZnNbO_(6):Bi^(3+),Sm^(3+)的发光性质及Bi^(3+)和Sm^(3+)离子间的能量传递机理

Luminescence properties and energy transfer mechanism between Bi^(3+)and Sm^(3+)of color-tunable LaSrZnNbO_(6):Bi^(3+),Sm^(3+)phosphors

采用高温固相法合成了系列LaSrZnNbO_(6):Bi ^(3+),Sm ^(3+)荧光粉,并对其发光性质以及Bi ^(3+)、Sm ^(3+)离子间的能量传递机理进行了研究.结果显示,当以Bi ^(3+)的1S 0→3P 1激发位置(338 nm)激发Bi ^(3+)和Sm ^(3+)共掺杂LaSrZnNbO_(6)荧光粉时,在LaSrZnNbO_(6)荧光粉的发射光谱中同时出现了Bi ^(3+)和Sm ^(3+)的发射峰,表明在LaSrZnNbO_(6)基质中存在Bi ^(3+)→Sm ^(3+)的能量传递.经计算,Bi ^(3+)离子和Sm ^(3+)离子间的能量传递效率可达到86.9%.通过改变Bi ^(3+)离子和Sm ^(3+)离子的掺杂浓度可以使LaSrZnNbO_(6)荧光粉的CIE色坐标由蓝光区域移动至粉白光区域,表明通过调节掺杂浓度可制备出颜色可调谐的荧光粉.

A series of LaSrZnNbO_(6):Bi^(3+)/Sm^(3+)/Bi^(3+),Sm^(3+)phosphors were synthesized by high temperature solid state reaction method.Their luminescence properties and energy transfer mechanism between Bi^(3+)and Sm^(3+)were investigated in this paper.The results show that the emission spectra of Bi^(3+)and Sm ^(3+)co-doped LaSrZnNbO_(6) phosphors exhibits both of Bi^(3+)and Sm^(3+)emission peaks with excited at the excitation wavelength of 338 nm which is the 1S 0→3P 1 transition of Bi^(3+).It indicates that Bi ^(3+)→Sm^(3+)energy transfer exists in LaSrZnNbO_(6) host.By calculating,the energy transfer efficiency between Bi^(3+)and Sm^(3+)ions can reach 86.9%.The CIE coordinates of LaSrZnNbO_(6) phosphors can be moved from the blue region to the pink-white region by changing the doping concentration of Bi^(3+)and Sm ^(3+)ions,indicating that color-tunable phosphor can be prepared by adjusting the doping concentration.