Preparation And Luminescence Properties Of Rare-Earth-Ion-Doped Borate

Because of the special levels structure that the Rare-earth element are often used in luminescent materials. And Rare-earth luminescent materials is widely used in life because of its excellent optical properties.Borate as a matrix has some advantages such as the low synthesis temperature simple synthesis process and chemical stability. Fluorescent lamps has good display color performance high luminous efficiency low light decay characteristics and become a hot research. REBa3B9O18(RE:Eu, Sm, Gd, Tb, Lu) are series of newly discovered isomorphic borate compounds. It is possible to uesd as a matrix because of the B3O6plane parallel group in the crystal structure,and making luminescent material with excellent performance by Rare-earth ions doped. Eu3+doped SmBa3B9O18, Er3+doped and Er3+\Yb3+co-doped YBa3B9O18were successfully synthesized by conventional solid-phase methods. And made the following research:1) Through the analysis of the experimental conditions, successfully synthesized (x=20%,40%,60%) materials. X-ray diffraction results show that Eu3+doping does not change the hexagonal structure. Lamellar morphology of the sample was seen under the scanning electron microscopy,it is due to the hexagonal structure of the materials. Then we achieved excitation and emission spectra test for the samples with different doping concentration. Proved energy transfer phenomenon between matrix and dopants.And the emission spectrum peaks corresponding energy level transitions were marked. By compare the luminous intensity of the material with different doping concentrations showed the emission intensity is enhanced to improve the doping concentration.No concentration quenching phenomenon.2) Er3+doped and Er3+\Yb3+co-doped YBa3B9O18were successfully synthesized by conventional solid state solidification methods. X-ray diffraction results show that Er3+, Yb3+doping does not change the hexagonal structure. The characteristic emission peak of Er3+was observed for YBa3B9O18:Er3+by using325nm light excitation, the energy transfer between YBa3B9O18and Er3+was observed. The upconversion luminescence of Er3+were observed on Er3+doped and Er3+\Yb3+co-doped YBa3B9O18phosphor excited by using980nm laser. The conversion process was explained by the energy level diagram. Experimental results show that the upconversion luminescence of Er3+can be sensitized by Yb3+.