Zn2 GeO4:Mn2+绿色磷光粉的制备和长余辉性能

采用高温固相反应法合成了Zn_2GeO_4∶xMn~(2+)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Zn_2GeO_4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,Zn_2GeO_4∶Mn~(2+)发射出强的530 nm绿光,优化掺锰离子浓度为0.5%。同时发现Zn_2GeO_4∶0.2Mn~(2+)磷光粉暗场条件下的余辉时间超过180 min,详细讨论了Zn_2GeO_4∶Mn~(2+)长余辉发光的内在机理。

Preparation of Zn2GeO4: Mn2+ Green Phosphors and Investigation of Afterglow Characteristics

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.