Study On Synthesis And Photoelectricity Properties Of Er/Yb Doped LiNb_1-xTa_xO₃

With the continuous development of science and technology, the luminescentmaterials rare earth ions doping in, have been widely applied to laser device,3-Ddisplay, holographic storage and fluorescence labeling, because of the materials canown upconversion luminescence performance. Therefore, it is very important for therealization of the short wavelength laser output, the study of rare earth ions dopedmaterial is urgently needed. LiNbO₃and LiTaO₃crystals have good piezoelectric,ferroelectric, nonlinear optics and acousto-optic performance, therefore, they made largecontributions to national defense and national economic construction. So far, the studyabout the solid solution of LiNbO₃and LiTaO₃is less, LiNb_1-xTa_xO₃doping rare earth isa newfashioned luminescent material. This article is want to study the luminescence andferroelectric performances via doping rare earth.LiNb_1-xTa_xO₃: Er³⁺/Yb³⁺ceramics were synthesized via high temperature solid statemethod, selected LiNb_0.3Ta_0.7O₃as the material of our experiment by the upconversionluminescence test, while X is0.7. The host material was synthetized under900℃, andthe ceramic was sintered under1250℃for6h. The XRD results showed there was noeffect on the dopant ions in the crystal lattice of LiNb_0.3Ta_0.7O₃.Under the excitation of980nm, the upconversion luminescence performance of therare-earth doped different LiNb_0.3Ta_0.7O₃ceramics were investigated. The upconversionluminescence spectra of the LiNb_0.3Ta_0.7O₃: Er³⁺/Yb³⁺ceramics have two obviousemission peaks at550nm and660nm, the upconversion luminescence is from the4F9/2â†'4I15/2and2H11/2/4S3/2â†'4I15/2transiting of Er³⁺, and the power curve showed theupconversion luminescence processes are all two photons processes, and moreover theexperiment tested the luminescence decay curve of these samples, then analysed thefluorescence lifetime of upconversion luminescence energy level, above all further studiedthe mechanism of upconversion. Moreover, the occupied situations of doping rare earth ionswere analysed via ultraviolet-visible absorption spectra.The doping Er³⁺ions LiNb_0.3Ta_0.7O₃ceramics were tested on hysteresis loops, whenthe sintering temperature was1300℃, then the remanent polarization was the moremaximum value, and the shape of hysteresis loop is simliar to―S‖. When the dopingmolarity of Er³⁺ions is0.5mol%, the remanent polarization and the maximumpolarization were the more maximum value, and the coercive field was the most minimum.Otherwise, there was offset electrical hysteresis loop in LiNb_0.3Ta_0.7O₃: Er³⁺ceramics.