Upconversion Luminescence Properties Of PSZT Under Different Temprature And Polarizition

Upconversion emission materials have potentially been used in three-dimensional displays, detectors for infrared radiation, temperature sensors, fluorescent labels for biomolecules, etc. Fluorescence properties of the upconversion emission materials are largely influenced by kind and concentration of the incorporated rare earth ions and changing of crystal field of matrix. Because the crystal field of matrix in upconversion emission materials can be changed by temperature and polarization, it is important to study the effect of temperature and polarization on fluorescence properties of the upconversion emission materials. In this paper, rare earth ion doped zirconium lead titanate (PZT) and lead strontium zirconate titanate (PSZT) are prepared by the polymer network method and the solid state method. The effects of kind and concentration of the incorporated rare earth ions on fluorescence properties of the upconversion emission materials are studied. Under different temperature and polarization condition, the fluorescence properties of the upconversion emission materials are investigated.The structure and of morphology of rare earth ion doped PZT and PSZT are characterized by XRD and SEM. Power and ceramic of PZT and PSZT are of Perovskite structure. Under 980 nm LED laser excitation, Er³⁺-doped PZT mainly emit green light at 525, 545 nm, corresponding to the 2H11/2, 4S3/2 level to the ground state 4I15/2 electronic transition in Er³⁺. Er³⁺-Yb³⁺ co-doped PZT mainly emit red light at 650 nm, corresponding to the 4F9/2 level to the ground state 4I15/2 level of the electronic transition in Er³⁺.As the upconversion fluorescence properties of rare earth doped PZT powder and ceramics, under 980 nm laser excitation, Er³⁺-doped PSZT mainly launched green light, corresponding to the 2H11/2, 4S3/2 level to the ground state 4I15/2 electronic transition in Er³⁺. Er³⁺-Yb³⁺ co-doped PSZT mainly launched green light, corresponding to the 4F9/2 level to the ground state 4I15/2 level of the electronic transition in Er³⁺. Tm³⁺-Yb³⁺ codoped PSZT powder and ceramics mainly launched blue light, corresponding to the 1G4 level to the ground state 3H6 level electronic transition of Tm³⁺.PSZT ceramics spectra are tested under variable temperature conditions and the polarized conditions. Fluorescence intensity ratio variation of green upconversion emissions at 525 and 545 nm in Er³⁺ doped PSZT and red upconversion emission at 655 and 675 nm in Er³⁺-Yb³⁺ co-doped PSZT have been studied as a function of temperature. It has been recognized that with increasing temperature, the upconversion luminescence intensity gradually weakened. Through the establishment of the relationship between light intensity and temperature, the temperature-sensitive properties of rare earth doping PSZT ceramics were evaluated.Conditions in the polarization of the PSZT ceramic upconversion tests showed that when the electric field were lower than the coercive field it has no effect on light intensity, when the electric field exceeds the coercive field, the conversion luminescence intensity will decrease.