Preparation And Optical Properties Of Rare Earth Eu Ion Doped Oxides

Zinc Rare earth elements are the most common dopants in most luminescent materials and are often used as fluorescent activators.Such elements not only have rich electronic energy levels,but also have a 4-f electron-layer structure with multiple metastable states.Therefore,the rare-earth ions doping in oxides can use the orbital transition of f-d or f-f of rare-earth ions.It is also possible to take advantage of the unique optoelectronic properties of oxides such as zinc oxide and ruthenium oxide,which is a supplement to the photoelectric performance of material devices.Eu3+ion has attracted attention because of its narrow emission band and easy luminescence in rare earth elements.The investigation of rare-earth ion doped oxide materials at present was mainly focused on the effects of doping methods,doping concentration and annealing temperature on the experimental results.In this paper,ZnO:Eu3+ thin films on different substrates were prepared by pulsed laser deposition method,and ZnO:Eu3+particles with the same doping concentration were prepared by sol-gel method.In addition,Y2O3:Eu3+ particles were prepared by high temperature solid-state method and their luminescence properties were analyzed.The followings are the specific research contents and conclusions:1.Pulsed laser deposition technology(PLD)are used to prepare ZnO:Eu3+ sample films on silica substrates and sapphire substrates;respectively,which are characterized by X Ray diffraction,photoluminescence(PL)spectra,and field emission scanning electron microscope(FE-SEM).The crystalline structure,luminescence properties and surface morphology of the samples before and after annealing were studied.The doped zinc oxide(Eu:ZnO)targets were bombarded with laser pulses,and the fabricated parameters were adjusted to obtain the corresponding Eu:ZnO film samples,then the samples were analyzed.XRD results showed that the sample was preferentially grown along C axis,and no other heterophases were observed.The PL spectra show that the samples have red emission.And the effects of different substrates on the crystalline quality and luminescence were studied.It was found that the crystalline quality of the films grown on sapphire substrate was better than that on silica substrate.The ZnO:Eu3+ samples with the same doping concentration were also prepared by sol-gel method.Compared with the samples fabricated by PLD samples,it was found that the samples prepared by PLD were better.2.Y2O3:Eu3+ particles were prepared by high temperature solid-state method at 800?and 1000?,respectively.The XRD patterns showed that the diffraction peaks position of the samples were basically same with that of the standard spectra,which indicates the sample growing well.The characteristic excitation peak of Eu3+ in the sample was found in the PL emission spectra,indicating that Eu3+ ions have been incorporated into Y2O3.From the figures of FE-SEM,it can be seen the sample has a jagged morphology with spherical particles and a certain degree of agglomeration.And it was found that the sample grown at 1000? was slightly better than the sample grown at 800?.