Research On Preparation And Optical Frequency Conversion Characteristic Of Rare Earth Doped Oxy-fluoride Materials

Frequency conversion characteristic of rare earth doped optoelectronic material for luminescence and laser protection applications has been a hot spot internationally.Rare-earth doped material can absorb laser energy with multiple wavelengths because of its abundant energy level transition effect,producing fluorescence while consuming the energy of incident light,significantly reduce laser reflectivity,so it is a great potential for development of light-emitting and laser protective materials.Er³⁺/Yb³⁺ codoped and Sm³⁺ doped oxy-fluoride frequency conversion materials were prepared by high-temperature solid-state melting method in this article.The phase and morphology of the materials were analyzed by XRD and SEM,strength parameters and spectra parameters were calculated using J-O theory to study the frequency conversion characteristics of the materials with the change of temperature and concentration of rare earth ions doped which is based on the measurement of the absorption,up-conversion and down-conversion spectra;luminescent color changes with Yb³⁺ ions doping concentration of Er³⁺/Yb³⁺ co-doped materials were studied by the calculating the CIE coordinate.Laser protection properties for the specific wavelength were analyzed based on the absorption spectra measured by integrating sphere method and the combat environment test by rangefinder.Results and conclusions got in this paper as follows:?1?Sm³⁺-doped oxy-fluoride particles is a good orange light emitting material,Sm³⁺ ions concentration quenching effect occurs at 2mol%,analysis of the Judd-Ofelt theory fits well with the experimentally measured results proved the best downconversion characteristic of the OFSm03 sample;test for the laser protection properties of specific wavelength using lasing ranging method proved Sm³⁺-doped material is an ideal laser protective material with good barrier properties.?2?Er³⁺/Yb³⁺ co-doped oxy-fluoride materials have promising infrared absorbing properties,analysis of the Judd-Ofelt theory fits well with the experimentally measured results proved the material is a great potential in the infrared upconversion materials,oxy-fluoride particles are good matrix materials with low phonon energy.?3?Er³⁺/Yb³⁺ co-doped oxy-fluoride materials have down-conversion fluorescence in the visible band at 431-451 nm,452-487 nm,488-523 nm and 524-549 nm excited at 325 nm,fluorescence intensity changes with the Yb³⁺ ions doping concentration,analysis of the Judd-Ofelt theory fits well with the experimentally measured results of the material proved good down-conversion luminescent properties of the sample.?4?Er³⁺/Yb³⁺ co-doped oxy-fluoride material exhibit red and green fluorescence in the visible light band under 980 nm excitation,the intensity of the red and green light changes with the Yb³⁺ ions doping concentration so that the material can emit a wide range of colors including green?0.309,0.674?,yellow?0.449,0.516?,orange?0.556,0.418?,and the orange-red?0.564,0.321?,it is a promising up-conversion material.