Electrospinning preparation and luminescence properties of La_2O_3:Ce~(3+)/Tb~(3+) nanofibers

摘要

One-dimensional Ce~(3+) and Tb~(3+)-co-doped La_2O_3 (La_2O_3:Ce/Tb) nanofibres were formed using a simple electrospinning technique followed by a calcination process. XRD, SEM, TEM, and photoluminescence (PL) are used to characterise the resulting samples. Through a heat-treatment process at high temperature, the as-prepared samples are well-crystallised with the hexagonal La_2O_3 structure. The energy transfer process from Ce~(3+) to Tb~(3+) in La_2O_3:Ce~(3+)/Tb~(3+) nanofibres was also studied at fixed Ce~(3+) concentrations and changed Tb~(3+) concentration. The results show that the green light of Tb~(3+) became stronger with the increase of Tb~(3+) concentrations. The fluorescence lifetime of Tb~(3+) ~5D_0 level first increases with the increase of doping concentration and reaches its maximum at 10 mol%, and then decreases.