Na_2GdPO_4F_2:Tb^(3+)绿色荧光粉阴极射线发光研究

Cathodoluminescent Properties of Na_2GdPO_4F_2:Tb^(3+) Green Phosphors

通过高温固相法制备Na2GdPO4F2∶Tb3+绿色荧光粉,并利用X射线粉末衍射(XRD)和阴极射线光谱分别对其物相、阴极射线发光性能进行研究。结果表明,Tb3+作为绿色发光中心进入到Na2Gd2PO4F2的晶格中取代Gd3+的格位,在低电子束(0.5~5 kV)激发下主要表现出Tb3+的特征跃迁(5D3,4→7FJ,J=6~2),其中以5D4→7F5跃迁(546 nm)为主。样品Na2Gd0.95Tb0.05PO4F2在阴极射线激发下的色坐标为(0.240 3,0.438 6)。随着电压、电流和掺杂量的增加,荧光粉的发光强度逐渐提高,其中,最佳的样品为Na2Gd0.9Tb0.1PO4F2。

The green emitting phosphors,Na2GdPO4F2∶Tb3＋,was synthesized by high temperature solid-state method.X-ray diffraction（XRD） and cathodoluminescence（CL） spectrum were used to characterize the samples.Under the low-voltage electron beam（0.5~5 kV） excitation,the Tb3＋-doped Na2GdPO4F2 phosphor showed a very strong green emission corresponding to the characteristic transitions of Tb3＋（5D3,4→7FJ transitions,J=6~2） with the strongest emission at 546 nm,corresponding to 5D4→7F5 of Tb3＋.The cathodoluminescent color of Na2Gd0.95Tb0.05PO4F2 was green to the naked eye with the Commission International de l＇Eclairage（CIE） coordinates of x=0.240 3,y=0.438 6,and the color temperature at about 8 634.3 K.The CL intensity increases upon raising the accelerating voltage,filament current and the doping concentrations,thereinto,the optimal concentrations of Tb3＋ is 10 mol%.