Electrospinning Of Rare Earth Ions Doped Lanthanum Oxychloride Nanofibers With Fluorescence Properties

Rare earth doped oxychlorides nanofibers were prepared by electrospinning and calcination technique using polyvinyl alcohol as template. Doping concentration and calcination temperature have an important effect on the shape of samples,further affecting their fluorescence properties. Furthermore the color is tunable by the coexcitation of rare earth ions,the energy transfer from the host to rare earth ions and the sensitization effect between them. These findings provide a new method for preparing fluorescent material of rare earth doped oxychlorides. The details are as follows:The spinning solution of LnCl3/LaCl3/PVA (Ln=Eu,Tb,Sm) was prepared, in which PVA serves as a template and rare-earth compounds serve as raw materials. During electrospinning,24 kV voltage was applied, the jet flow rate was 0.2 mL/h, and the tip to collector distance was 15 cm. A series of LaOC1:Ln3+ (Ln=Eu,Tb,Sm) nanofibers were finally obtained after a calcination process. The results show that LaOCl:Ln3+ nanofibers composed of wafer nanograins with diameters of 30-50 nm have the highest luminous efficiency when 5% mol of rare earth ions concentration is doped at 750℃.The spinning solution of EuCl3/CeCl3/LaCl3/PVA. was prepared, in which PVA serves as a template and rare-earth compounds serves as raw materials. Then fluorescent LaOCl:Eu+,Ce+ nanofibers were successfully fabricated via an electrospinning and calcination route. During electrospinning,24 kV voltage was applied, the jet flow rate was 0.2 mL/h, and the tip to collector distance was 15 cm. The results show that the the maximum luminous efficiency is reached when the concentration ratio of Eu3+:Ce3+ is 3:1 at 750℃.