【摘要】 Pr³⁺4f5d具有大的辐射跃迁速率,是高效快响应闪烁体材料较有前景的发光中心离子。本文采用高温固相法制备了Pr³⁺掺杂Ba₃La（PO₄）₃（BLP）光转换材料,对其物相、真空紫外发光性质、X射线激发发光性质、发光衰减特性和发光热稳定性进行了表征。结果表明,BLP∶Pr³⁺具有高效的Pr³⁺4f5d宽带发光,发光寿命为～15 ns,且具有较好的发光热稳定性。在基质172 nm激发下,存在基质到Pr³⁺4f5d的能量传递,而在X射线激发下可能受表面缺陷影响未发现明显的Pr³⁺4f5d发光。本文研究结果表明,BLP∶Pr³⁺在作为真空紫外到UV-C光转换材料方面具有潜在的应用价值。本研究对于设计新型快响应闪烁体具有一定的指导意义。更多还原

【Abstract】 The radiative transition rate of Pr³⁺4 f5 d is large, which makes it as a promising luminescence center of fast scintillators. Samples of Ba₃La（PO₄）₃（BLP） activated with Pr³⁺ were prepared through high temperature solid state method and characterized by XRD, temperature-dependent luminescence spectra upon VUV-UV and X-ray excitations and decay curves. Efficient and thermal stable Pr³⁺4 f5 d broad band emission with decay time of ～15 ns was observed. There is energy transfer from host to Pr³⁺4 f5 d upon excitation at 172 nm, however, the energy transfer is absent upon X-ray excitation which is attributed to influence of defects on surface. The results indicate that BLP∶Pr³⁺ could be applied as an efficient VUV to UV-C converting material. In addition, the research is also important for designing novel fast scintillators.更多还原