科研之友
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摘要
The cooperation between host and activator ions in nature could enable novel controllability of emission colors in single host. This work presents the vacuum ultraviolet-visible (VUV-Vis) spectroscopic properties of Tb3+-doped NASICON-type RE1/3Zr2(PO4)(3) (RE = Y, La, Gd and Lu) prepared by a Pechini method. The cooperation between self-active host and Tb3+ ions leads to tunable emission from the (greenish-) blue to yellowish-green region by appropriate adjusting the Tb3+ content. The visible cross relaxation between Tb3+ ions and energy transfer from host/Gd3+ to Tb3+ were observed and confirmed. A detailed energy level diagram that contains 4f levels of all divalent and trivalent lanthanide ions with respect to the valence and conduction bands of Gd1/3Zr2(PO4)(3) has been constructed and explained. In addition, the energy transfer processes and cross relaxation processes were discussed.
