Template Method Controllable Growth And Luminescent Properties Of Red Long Persistent Phosphors Of One-dimensional Y₂O₂S:Eu³⁺,Mg²⁺,Ti⁴⁺

1-D nanostructure luminescence materials begin to get the attention of people. If the rare earth compounds were fabricated in the form of one-dimensional nanostructures, they would have some new properties as a result of both their marked shape-specific and quantum-confinement effects. When the particle size of luminescent materials matrix to the nanoscale range, its physical properties are changed, and luminous and dynamical properties are affectted, such as fluorescence lifetime changes, line shift, line broadening, and so on,which is different from that of the conventional light emitting materials,.In this work, Y2O2S:Eu3+, Mg2+, Ti4+red long-lasting phosphors was prepared. At first, the controlled preparation of hydrogen yttrium oxide precursor was studied. Then, doping ions and sulfured the precursor, finally Y2O2S:Eu3+, Mg2+, Ti4+long-lasting phosphors with1-D rod-like morphology has obtained. The detailed conclusions were summarized:(1) Influence factors such as solvent ratio, reaction temperature, PH and alcohol solvent on the morphology and phase of hydrogen yttrium oxide precursor were studied, and then, the best condition to prepare rod-like hydrogen yttrium oxide precursor was at T=180℃,t=12h, PH≈13, V(Y(NO3)3): V(C2H5OH):V(H2O)=3:2:4. And the condition to prepare tube hydrogen yttrium oxide precursor was at T=180℃, t=12h, PH≈13, V(Y(NO3)3):V(C2H5OH): V(H2O)=3:3:6or T=180℃, t=12h, PH≈13, V(Y(NO3)3):V (MEG):V (H2O)=3:3:6.(2) Rod-like hydrogen yttrium oxide precursor was calcinated to get yttrium oxide at different temperatures. Rod-like structure of yttrium oxide can maintain under500℃. Rod-like hydrogen yttrium oxide precursor mixed with Eu2O3, Mg (OH)2-4MgCO3·6H2O and TiO2were calcinated to get Y2O3:Eu3+, Mg2+, and Ti4+at different temperatures. Rod-like structure of Y2O3:Eu3+, Mg2+, Ti4+can maintain at800℃.(3) Rod-like Y (OH)3precursor together with Mg(OH)2·4MgCO3·6H2O, Eu2O3and TiO2are mixed and sulfuretted at different temperature to get Y2O2S:Eu3+, Mg2+, Ti4+red long-lasting phosphors. Sulfuretted method with the mixture of carbon powder and sulfur powder revealed that the rod-like Y2O2S:Eu3+, Mg2+, Ti4+is synthesized at750℃. When the sulfuretted temperature is1000℃, zero-dimension nanoparticals are gat. The luminous property is weaker by using graphite crucibles as sulfured method, but the highest temperature to keep the rod-like morphology is rising to1000℃.(4) Rod-like Y(OH)3precursor together with Eu2O3, C16H36O4Ti and Mg(OH)2-4MgCO3·6H2O are mixed using sol-gel method. Then, it was sulfured at different temperature to get Y2O2S:Eu3+, Mg2+, Ti4+red long-lasting phosphors. The morphology is damaged at lower temperature, but the afterglow performances are better than that of others synthesis using other methods.