近红外光诱导下NaYbF4:Tm3+,Eu3+ 体系中Eu3+的上转换发光

利用水热法制备得到NaYbF₄:0.01%Tm³⁺,20%Eu³⁺上转换材料,利用X射线衍射分析、扫描电子显微镜及光谱测试技术分别对其进行了结构、形貌以及光谱性质的表征。在980 nm近红外激光激发下,得到了Eu³⁺的可见到紫外范围的上转换荧光发射。分析表明:共掺杂NaYbF₄纳米材料中Tm³⁺到Eu³⁺离子的能量传递对布居Eu³⁺离子的激发态能级,获得Eu³⁺的上转换发光起着至关重要的作用。另外,在实验中首次获得了Eu³⁺对应于³P₀→⁷F_j (j=0,1,2)能级跃迁的上转换光发射。

Upconversion Luminescence of Eu3+ in NaYbF4:Tm3+,Eu3+ Nanocrystals Induced by 980 nm Excitation

NaYbF4∶0.01%Tm3+,20%Eu3+ nanocrystals were synthesized by hydrothermal method.The crystalline phase,morphology,and optical properties were characterized by X-ray diffraction,scanning electron microscope and luminescent spectra.The samples are nano-rods with uniform size distribution.Their length is 500 nm and diameter is 200 nm on average.Under 980 nm near-infrared laser excitation,ultraviolet and visible upconversion luminescence of Eu3+ was obtained.In the codoped NaYbF4 nano-rods,the energy transfer from Tm3+ to Eu3+ and the bridging effect of Tm3+ ions play important roles in populating the high-energy excited states of Eu3+.Furthermore,the upconversion emissions from 3P0→7Fj(j=0,1,2) of Eu3+ were observed for the first time.