Color tunable phosphorescence in KY3F10:Tb3+ for x-ray or cathode-ray tubes

We report a persistent phosphor of KY3(1-x)Tb3xF10 (KY3F10:xTb(3+)) synthesized by solid-state reaction for x-ray or cathode-ray tubes. The phosphorescence consists of a group of blue and green emission lines originating from D-5(3)-> F-7(J) and D-5(4)-> F-7(J) transitions of Tb3+, respectively. The phosphorescent emitting color can be tuned from blue to green by gradually increasing Tb3+ concentrations, which is attributed to the enhanced D-5(3)-D-5(4) relaxation through the cross relaxation between two Tb3+ ions, as described by of (D-5(3),F-7(6))-(D-5(4),F-7(0)). The Tb3+ concentration dependent phosphorescence spectra are well simulated based on the analysis of luminescence dynamical processes using the Judd-Ofelt theory and rate equations concerning the D-5(3) and D-5(4) levels. The energy charge and release pattern of the phosphor are presented and a 10% decay time is 29 s. The measurement of the thermoluminescence glow curve gives convincing evidence for the traps analysis.

我们报道了一种通过固相反应合成的用于X射线或阴极射线管的KY3(1 - x)Tb3xF10（KY3F10:xTb³⁺）长余辉磷光体。该磷光由分别源自Tb³⁺的⁵D₃→⁷F_J和⁵D₄→⁷F_J跃迁的一组蓝绿色发射谱线组成。通过逐渐增加Tb³⁺浓度，磷光发射颜色可从蓝色调至绿色，这归因于两个Tb³⁺离子之间的交叉弛豫增强了⁵D₃ - ⁵D₄弛豫，如（⁵D₃，⁷F₆） - （⁵D₄，⁷F₀）所描述。基于使用Judd - Ofelt理论对发光动力学过程的分析以及关于⁵D₃和⁵D₄能级的速率方程，对Tb³⁺浓度相关的磷光光谱进行了很好的模拟。给出了磷光体的能量存储和释放模式，并且10%的衰减时间为29秒。热释光 glow曲线的测量为陷阱分析提供了令人信服的证据。