The Structure And Luminescence Properties Of Rare Earth Ions Eu³⁺,Tb³⁺ Doped The ZnS,ZnO,TiO₂,SiO₂Combinations As The System Of Materials

WLED (White light-emitting diode) is recognized as the fourth LEDs in21st century, which has many advantages such as energy saving, high efficiency, long-lasting performance, environmental friendliness and so on. Near-UV chip+red/blue/green phosphors are common methods to prepare WLEDs. Therefore, the focal issue now is researching the materials which can be efficiently excited by UV-light and have bright red/green/blue luminescence.This paper depends on the method of sol-gel and precipitation, which are proved that the phosphor luminescent intensity of Eu3+:Y2O2S is stronger than Eu3+:Y2O3. The results show that the emission intensity enhances with doping S, which may improve properties of phosphors. In this paper, Eu3+doped ZnO1-xSx, ZnO1-x-SiO2, ZnO1-xSx-2TiO2and ZnO1-xSx-2TiO2-SiO2luminescent materials are synthesized by sol-gel method combined with precipitation method. The crystals structure and the luminescent properties of samples were measured and characterized by DTA-TG, IR, XRD, TEM, SEM, excitation and emission spectra, respectively.The study of luminescent materials of different matrix doped with Eu3+has received considerable things. The results indicated that the content of Eu3+:ZnO1-xSx was ZnS, ZnO and ZnEu2O4, which annealing at800℃. In addition, the best excitation wavelength was at465nm when the wavelength of the monitoring light was at612nm. Phosphors sintered at800℃were found to have the maximum PL intensity for ZnO1-xSx doped with10mol%. The content of Eu3+:ZnO1-xSx-SiO2phosphors were ZnS,ZnO and Zn2Si04, which annealing at800℃; the best excitation wavelength was at395nm when the wavelength of the monitoring light was at612nm. With phosphors sintered at800℃and ZnO1-xSx-SiO2doped with10mol%PL intensity get maximum. The results showed that the emission intensity enhances with doping S and SiO2, which may improve properties of phosphors.The Eu3+doped ZnO1-xSx-2TiO2phosphors have TiO2and ZnS, which is annealing at600℃. The best excitation wavelength is at465nm when the wavelength of the monitoring light is at612nm. Phosphors sintered at600℃were found to have the maximum PL intensity for ZnO1-xSx-2TiO2doped with5mol%. The Eu3+:ZnO1-xSx-2TiO2-SiO2phosphors were consisted of TiO2、 ZnTiO3and ZnS. The maximum PL intensity for ZnO1-xSx-2TiO2-SiO2doped Eu3+is at6mol%. The best excitation wavelength is at465nm. The results show that the emission intensity enhances with doping S, which may improve properties of phosphors. But these two kinds of luminescent properties of luminescent materials are worse than Eu3+:ZnO1-xSx-SiO2materials. The results show that the emission intensity enhances with doping TiO2, which can not improve luminescent properties of phosphors.The study of luminescent materials of different matrix doped with Tb3+has received considerable things. The Eu3+:ZnO1-xSx phosphors are consisted of ZnS and ZnO, which is annealing at800℃. In addition, the best excitation wavelength is at219nm when the wavelength of the monitoring light is at544nm. Phosphors sintered at800℃were found to have the maximum PL intensity for ZnO1-xSx doped with11mol%. The Tb3+doped ZnO1-xSx-SiO2phosphors have ZnS, ZnO and Zn2SiO4, which is annealing at800℃. The best excitation wavelength is at377nm when the wavelength of the monitoring light is at544nm. Phosphors sintered at800℃were found to have the maximum PL intensity for ZnO1-xSx-SiO2doped with10mol%. The results show that the emission intensity enhances with doping S and SiO2, which may improve luminescent properties of phosphors. The results show the emission intensity enhances with doping S, which may improve luminescent properties of phosphors. So we can choose the composite subs-trate prepare the red, green fluorescent powders which have more superior light-performance.