Preparation And Luminescent Properties Of Rare Earth Ion Doped Nanocrystalline Zro₂-al₂o₃ Composite Powder

Preparation and room temperature emission of nanocrystalline ZrO2-Al2O3:RE(Er3+,Eu3+,Dy3+,Er3+/Yb3+)are important results.The nanocrystalline ZrO2-Al2O3 undoped and doped by Er+,Eu3+,Dy3+, Er 3+/Yb3+are prepared by co-precipitation method in this paper. Crystal structure of powder samples is examined by XRD. The mean grain size of the materials ranges from 7nm to 30nm by controlling the doped concentrations, sintering temperatures. The effect of the doped rare earth, sintering temperatures on the crystal structure of powder samples has been discussed. As the calcination temperature increasing,ZrO2 transformation from tetragonal to monoclinic phase.At the same time a-Al2O3 crystal phase, According to the crystalline phase diagram of this pure nanocrystalline ZrO2-Al2O3 composite powder shows that the ZrO2 phase transformation are inhibited by the presence of Al2O3 composite powders. At the same time incorporation of rare-earth ions effect on the tetragonal to monoclinic phase transition also.Nanocrystalline ZrO2-Al2O3:Er3+ series of powder are prepared and observed Er3 + emission at room temperature.Prepared with different calcination temperature of nanocrystalline ZrO2:Er3+ have done a full comparison and research about Er3+ emission properties.With calcination temperature was increasing intensity of emission spectrum has changed, while the emission peak position have changed.For the first time prepared ZrO2-Al2O3:Er3+/Yb3+ Phosphor and study of nanocrystalline ZrO2-Al2O3:Er3+ and ZrO2-AlO3:Er3+/Yb3+ upconversion luminescence. Transition mechanism of upconversion are analysed. Found that ZrO2-Al2O3:Er3+ in red and green are the two-photon process and ZrO2-AlO3:Er3+/ Yb3+ upconversion spectrum are two-photon process for red and green, while the Blu-ray is very weak three-photon process.This article also prepared ZrO2-AlO3:Eu3+ Phosphor body and studied the emission at room temperature, When excitation wavelength 394nm at 1100℃different concentrations of rare earth ions Eu3+ characteristic emission at room temperature is very strong. Due to Stark splitting will be 604nm 610nm peak, while the 610nm peak with doping concentration increasing gradually disappear, as the doping amount of the reduction, Stark splitting serious and the symmetry significantly decreased also illustrates the Eu3+ ions on the stability of crystalline ZrO2 matrix effect. Monitoring wavelength 604nm excitation spectra obtained 246nm peak from Eu3+ ion charge transfer state absorption. CTB accounts for the main position was visous. Energy transfer between matrix and Eu3+ was happend.For the first time prepared ZrO2-Al2O3:Dy3+ phosphor and studied at room temperature emission. excitation wavelengs were 353nm. At 1100℃while the sample is located in the two main emission at 483nm 583nm, and 477 nm 490nm 497nm 577nm 589nm can launch the weaker same time, We also observed a particular emission peak that the emission peak was 383nm, which is a lot of Dy3+ emission in not common. As the calcination temperature increasing its main firing position change.