采用高温固相法合成了绿色荧光粉Zn2Ca(PO4)2:Tb3+,测定了该荧光粉的XRD图谱、激发光谱及发射光谱。XRD图谱表明在高温还原气氛下合成了纯相的荧光粉Zn2Ca(PO4)2:Tb3+。该荧光粉的激发谱位于340~400nm。在紫外激发下主要发射峰位于490、544、584、622nm,对应于Tb3+的5D4→7F6、5D4→7F5、5D4→7F4、5D4→7F3的特征发射。考察了Tb3+的掺杂浓度对样品发光效率的影响,分析了Tb3+的544nm发射的自身浓度猝灭机理并探讨了敏化剂Ce3+离子的加入对荧光粉发光的影响。此绿色荧光粉Zn2Ca(PO4)2:Tb3+是一种很有潜力的适于UVLED管芯激发的发光粉。
A green-emitting phosphor Zn2Ca(PO4)2:Tb3+ was prepared by high temperature solid-state reaction.The XRD pattern indicated that the phosphor of Zn2Ca(PO4)2:Tb3+ which was synthesized under reducing atmosphere at high temperature was pure phase.The results showed that the excitation spectra was located at 340-400nm and the emission peaks were at 490,544,584,622nm,corresponding to 5D4→7FJ(J=6,5,4,3) transitions of Tb3+.The effect of the contents of Tb3+ ion in Zn2Ca(PO4)2 on the luminescent intensity was studied.The self-quenching mechanism of the emission monitored at 544nm of Tb3+ was analyzed.And the effect on the luminescent property of the phosphor by adding the sensitizer Ce3+ was also investigated.The luminescence characteristics demonstrate that this green phosphor,Zn2Ca(PO4)2:Tb3+,has a potential application for UVLED.