Er3+、Eu3+双掺杂LaOF荧光粉的光学性能研究及防伪应用

有机发光材料可能对人体或环境造成影响，除此之外还有生产成本高、发光易淬灭、发光强度与颜色不易于控制的缺点，因此探索性能优越的稀土发光材料并寻找其应用价值是具有重要意义的。本文基于水热辅助固相法制备出Er³⁺、Eu³⁺离子共掺杂LaOF荧光粉，通过X射线衍射仪(X-ray diffractometer, XRD)、扫描电镜(scanning electron microscope, SEM)和荧光分析仪对不同Er³⁺掺杂浓度下的LaOF∶Eu³⁺荧光粉体的相组成、粒径尺寸、形貌及荧光光谱进行表征与分析。结果表明：在900℃的温度下煅烧，物相由前驱体LaF₃转变为四方相LaOF,且随着Er³⁺掺杂浓度的升高，在365 nm与393 nm波长激发下均呈现出多色可调谐的发光特性，其中365 nm激发下呈现自橙色光向黄色光的转变，而在393 nm光辐射下则由橙色光向品红色光过渡。将Er³⁺、Eu³⁺共掺杂LaOF荧光粉制成...

Optical properties study and anti-counterfeiting application of Er3+,Eu3+ co-doped LaOF phosphors

Organic light-emitting materials may have an impact on the human body or the environment.In addition,they also have the disadvantages of high production cost,easy quenching of lighting,and difficult control of lighting intensity and color.Therefore,it is of great significance to explore rare earth luminescent materials with superior properties and find their application value.The rare earth ion Er³⁺,Eu³⁺ co-doped LaOF phosphors were prepared by the hydrothermal-assisted solid-phase method.The phase composition,particle size,morphology and fluorescence spectrum of LaOF∶Eu³⁺ phosphors doped with Er³⁺ at different concentrations were characterized and analyzed by X-ray diffractometer (XRD),scanning electron microscope (SEM) and fluorescence analyzer.The results show that the precursor LaF₃ of phosphors is well transformed into tetragonal LaOF after calcining at 900 ℃,and with the increase of Er³⁺ doped concentration,the luminescent properties of the phosphors show a good rule at the excitation wavelengths of 365 nm and 393 nm.Among them,the excitation at 365 nm shows the transition from orange light to yellow light,while the excitation at 393 nm shows the transition from orange light to magenta light.Finally,Er³⁺,Eu³⁺ co-doped LaOF phosphor is made into ink and printed into patterns,and when it is excited at 365 nm and 395 nm,the orange and purple emission is visible,respectively,which shows that they can be used in the field of anti-counterfeiting.