Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou University, Dezhou 253023, PR China.
Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Sci Rep. 2016 Sep 15;6:33283. doi: 10.1038/srep33283.
A series of color tunable phosphors NaBa3La3Si6O20:Ce(3+), Tb(3+) were synthesized via the high-temperature solid-state method. NaBa3La3Si6O20 crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a = 14.9226(4) Å, b = 24.5215(5) Å and c = 5.6241(2) Å by the Rietveld refinement method. The Ce(3+) ions doped NaBa3La3Si6O20 phosphors have a strong absorption band from 260 to 360 nm and show near ultraviolet emission light centered at 378 nm. The Ce(3+) and Tb(3+) ions coactivated phosphors exhibit color tunable emission light from deep blue to green by adjusting the concentration of the Tb(3+) ions. An energy transfer of Ce(3+) → Tb(3+) investigated by the photoluminescence properties and lifetime decay, is demonstrated to be dipole-quadrupole interaction. These results indicate the NaBa3La3Si6O20:Ce(3+), Tb(3+) phosphors can be considered as potential candidates for blue-green components for white light emitting diodes.
通过高温固相法合成了一系列可调节颜色的荧光粉 NaBa3La3Si6O20:Ce(3+)，Tb(3+)。NaBa3La3Si6O20 通过 Rietveld 精修方法在非中心对称空间群 Ama2 中结晶，晶胞参数为 a = 14.9226(4) Å，b = 24.5215(5) Å 和 c = 5.6241(2) Å。Ce(3+) 掺杂的 NaBa3La3Si6O20 荧光粉在 260 到 360nm 有很强的吸收带，显示出位于 378nm 的近紫外发射光。Ce(3+) 和 Tb(3+) 共激活的荧光粉通过调整 Tb(3+)离子的浓度，可以实现从深蓝色到绿色的可调色发射光。通过荧光性质和寿命衰减研究了 Ce(3+)→Tb(3+)的能量传递，证实其为偶极-四极相互作用。这些结果表明，NaBa3La3Si6O20:Ce(3+)，Tb(3+)荧光粉可作为白光发光二极管中蓝绿色组件的潜在候选材料。
