Preparation And Luminescent Properties Of Metallic And Rare Earth Ions Codoped ZrO₂ Nanocrystalline

Rare-earth luminescence materials are applied widely to every aspect of our lives.Its excellent optical properties depends mainly on rare-earth ions and host materials properties.But the other factors can also have important impacts on it.In the rare-earth luminescence materials,the other metal ions being mixed with rare-earth ions,can provide the electron transition of rare-earth ions with more abundant energy level and it can also change the host Lattice so that affect the optical properties of luminescence materials.In this article,using the oxide ZrO₂ being low phonon energy,physical and chemical structure as the host material,I researched the crystal structure of the material,luminous property and energy transfer process through the analysis of the metal ion Bi ³⁺ doping to nanocrystalline ZrO₂:Eu³⁺-Bi³⁺,Li+ and Yb³⁺ doping to nanocrystalline ZrO₂:Er³⁺-Li+/Yb³⁺ influence on the performance of the light.The following is the main research contents of this paper:1.Eu³⁺,Bi³⁺ codoped ZrO₂ nanocrystalline powders were prepared by chemicalco-precipitation method.It is shown that the crystal phase of nanocrystalline ZrO₂:Eu³⁺-Bi³⁺ powders calcined at 600? is tetragonal,and it turns to the mixture of tetragonal and monoclinic phase while the temperature rise to 800?.950?,1100?.It is obviously that characteristic emissional intensity of Eu³⁺ in the tetragonal phase is greater than the intensity in the mixed phase.Bi³⁺ can sensitize the room temperature characteristic emission of Eu³⁺ in nanocrystalline ZrO₂.Through the observation of the stimulate spectrum of the sample,I find that the stimulate spectrum peak wavelength of sample just covers the launch region of ultraviolet and blue-ray LED.So,the low cost LEDs are used as the exciting illuminant of this kind of phosphor which is also a red fluorescent material being applied to the white-light LED.2.Er³⁺,Li+codoped ZrO₂ nanocrystalline powders were prepared by chemical co-precipitation method.The crystal phase of sample calcined at 600? is tetragonal.The monoclinic phase appears in the sample while the temperature rises to 800?.The sample turns to the monoclinic phase completely.The nanocrystallineZrO₂:Er³⁺-Li+doping Li+ can absorb the green light and the blue-purple,especially for the green light.With the increase of Li+ concentration,the light of ZrO₂:Er³⁺-Li+ weakens first and then it enhances.It is because that the symmetrical,then the asymmetric directional changes affects the transmission of energy.3.Er³⁺-Li+ codoped ZrO₂ nanocrystalline powders and SiO₂powders with Er³⁺-Yb³⁺ codoped ZrO₂ nanocrystalline powders were prepared by the microemulsion method.The diffraction peak of nanocrystalline ZrO₂:Eu³⁺-Bi³⁺powders calcined at 600 ? is pure tetragonal phase.And it turns to the mixture of tetragonal and monoclinic phase while the temperature rises to 950 ?.Then it turns to pure monoclinic phase while the temperature rises the 1100?.As the temperature rises,the relative strength of X-ray diffraction peak is little weak.The nanocrystallineZrO₂:Er³⁺ doping Yb³⁺ can absorb the green light and the blue-purple,especially for the green light.After being powdered with,the sample is calcinated by low temperature;its luminous intensity tends to weaken.The luminous intensity of sample being calcinated by high temperature is more obvious than before.