可调色荧光粉LaSrZnNbO6:Bi3+,Sm3+的发光性质及Bi3+和Sm3+离子间的能量传递机理

采用高温固相法合成了系列LaSrZnNbO₆:Bi³⁺,Sm³⁺荧光粉,并对其发光性质以及Bi³⁺、Sm³⁺离子间的能量传递机理进行了研究.结果显示,当以Bi³⁺的¹S₀→ ³P₁激发位置(338 nm)激发Bi³⁺和Sm³⁺共掺杂LaSrZnNbO₆荧光粉时,在LaSrZnNbO₆荧光粉的发射光谱中同时出现了Bi³⁺和Sm³⁺的发射峰,表明在LaSrZnNbO₆基质中存在Bi³⁺→ Sm³⁺的能量传递.经计算, Bi³⁺离子和Sm³⁺离子间的能量传递效率可达到86.9%.通过改变Bi³⁺离子和Sm³⁺离子的掺杂浓度可以使LaSrZnNbO₆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.

Luminescence properties and energy transfer mechanism between Bi3+ and Sm3+ of color - tunable LaSrZnNbO6: Bi3+,Sm3+ phosphors

A series of LaSrZnNbO₆:Bi³⁺/Sm³⁺/Bi³⁺,Sm³⁺ phosphors were synthesized by high temperature solid state reaction method.Their luminescence properties and energy transfer mechanism between Bi³⁺ and Sm³⁺ were investigated in this paper.The results show that the emission spectra of Bi³⁺ and Sm³⁺ co - doped LaSrZnNbO₆ phosphors exhibits both of Bi³⁺ and Sm³⁺ emission peaks with excited at the excitation wavelength of 338 nm which is the ¹S₀→ ³P₁ transition of Bi³⁺.It indicates that Bi³⁺→ Sm³⁺ energy transfer exists in LaSrZnNbO₆ host.By calculating, the energy transfer efficiency between Bi³⁺ and Sm³⁺ ions can reach 86.9%.The CIE coordinates of LaSrZnNbO₆ phosphors can be moved from the blue region to the pink - white region by changing the doping concentration of Bi³⁺ and Sm³⁺ ions, indicating that color - tunable phosphor can be prepared by adjusting the doping concentration.