Bi~(3+)/Yb~(3+)共掺GdVO_4近红外发光性能研究

使用高温固相法制备了一种新的Bi3+,Yb3+共掺杂GdVO4量子裁剪近红外发光材料,该材料在波长为250~400nm的紫外光激发下发射出很强的近红外光(900~1100nm).由于体系中Bi3+离子的引入,相对于Gd0.9Yb0.1VO4,Gd0.87Yb0.1Bi0.03VO4在989nm处的近红外发光强度提高近120%,且其激发峰也从323nm红移至341nm,整个激发谱带更宽,更有利于实际应用.由于Yb3+离子既可以利用基质中的VO3-4电荷迁移态跃迁的能量,也可以同时利用Bi3+的1S0-3P1能级跃迁传递能量,相对于目前报道的理论量子裁剪效率最高的YVO4:Bi3+,Yb3+,GdVO4:Bi3+,Yb3+无论其近红外发光强度还是可见光发光强度强度皆有提升,是一种很有希望的紫外宽带激发近红外发光材料.

NIR luminescent properties of Bi3+/Yb3+ codoped GdVO4

A novel NIR quantum cutting phosphor,Bi³⁺-Yb³⁺ codoped GdVO₄,has been prepared through a high temperature solid state method.Under UV excitation at 250~400 nm,it shows strong NIR emission ranging from 900 to 1 100 nm.NIR emission intensity of Gd_0.87Yb_0.1Bi_0.03VO₄ increased by 120% due to the introduction of Bi³⁺ ions,compared with that of Gd_0.9Yb_0.1VO₄,and its excitation spectrum peak shifted from 323 nm to 341 nm.The broadened excitation band will favor its applications.Compared with the most efficient quantum cutting phosphor reported,YVO₄:Bi³⁺,Yb³⁺,GdVO₄:Bi³⁺,Yb³⁺ has much stronger visible and NIR emission,because Yb³⁺ ions are effectively excited through the charge transfer state from VO^3-₄ units and the energy transfer ¹S₀-³P₁ from Bi³⁺.GdVO₄:Bi³⁺,Yb³⁺ is believed to be a valuable phosphor with broad excitation band and strong NIR emission.