采用高温固相反应法合成了Zn2GeO4∶xMn2+系列绿色长余辉磷光粉。XRD分析结果表明, 掺锰磷光粉的主要衍射峰位与锗酸锌晶体标准卡基本一致, 但略有红移。SEM照片显示, 相对于Zn2GeO4基质平均粒径而言, 掺锰磷光粉的颗粒尺寸均增大。在325 nm紫外光激发下, Zn2GeO4∶Mn2+发射出强的530 nm绿光, 优化掺锰离子浓度为0.5%。同时发现Zn2GeO4∶0.2Mn2+磷光粉暗场条件下的余辉时间超过180 min, 详细讨论了Zn2GeO4∶Mn2+长余辉发光的内在机理。

A series of Zn2GeO4∶xMn2+ green long afterglow phosphors have been synthesized by high temperature solid-state reaction method. XRD results show that the main diffraction peaks of phosphors doped Mn2+ ions are basically consistent with those in standard card of Zn2GeO4 crystal, but there exists slightly red shift. SEM photos present the particle sizes of phosphors doped different Mn2+ ions are all enlarged compared to average grain size of Zn2GeO4 host. The intense 530 nm green emissions from Zn2GeO4∶Mn2+ phosphors can be gained under 325 nm ultraviolet excitation and optimal Mn2+ doping concentration is 0.5%. At the same time, it is found that the afterglow time of Zn2GeO4∶0.2Mn2+ phosphor exceeds 180 min under the condition of dark environment, and the internal mechanism of long afterglow luminescence of Zn2GeO4∶Mn2+ phosphor is discussed in detail.