基于能量传递的Ba3Y2(BO3)4:Yb3+/Er3+颜色可调上转换发光研究

采用高温固相法合成了不同Yb³⁺掺杂量的新型Ba₃Y₂(BO₃)₄:Yb³⁺/Er³⁺上转换荧光粉。借助XRD、SEM、荧光光谱等表征方法研究了Yb³⁺掺杂量对材料晶体结构、上转换发光性能的影响,探讨了材料的上转换发光机制。结果表明,Yb³⁺、Er³⁺的掺杂未引入杂相,由于Yb³⁺、Er³⁺与Y³⁺离子半径相近,随着Yb³⁺掺杂量增加,晶胞参数呈现微弱的减小趋势。Yb³⁺掺杂量0.05时,荧光粉具有最大发光强度。调控Yb³⁺掺杂量,增强了Yb³⁺与Er³⁺间的能量传递,实现了样品发光颜色由绿色→黄色→红色的转变。在980 nm激光激发下,Er³⁺的绿光和红光发射均为双光子过程。

Color-Tunable Upconversion Luminescence of Ba3Y2(BO3)4:Yb3+/Er3+ Phosphors Based on Energy Transfer

A novel Ba₃Y₂(BO₃)₄:Yb³⁺/Er³⁺ upconversion phosphor with different Yb³⁺ doping concentration was synthesized by using solid-state reaction at a high temperature. The effects of doping concentration of Yb³⁺ on the crystal structure and upconversion luminescence properties of the synthesized materials were studied by means of characterization methods, such as XRD, SEM and fluorescence spectroscopy, and the upconversion luminescence mechanism of the materials was also discussed in detail. The results show that the doping of Yb³⁺ and Er³⁺ does not bring impurity phase. As Yb³⁺, Er³⁺ and Y³⁺ are similar in ionic radius, the cell parameters are slightly on the decrease with the increase of the Yb³⁺ doping concentration. When the Yb3+ doping concentration is 0.05, the phosphor has the maximum luminescence intensity. By regulating the Yb³⁺ doping concentration, the energy transfer between Yb³⁺ and Er³⁺ can be enhanced, and the luminescence color of the sample can change from green, yellow to red. Under the excitation of 980 nm laser, both green and red emissions of Er3+ are a two-photon process.