Effect of co-doped metal caions on the properties of Y sub(2)O sub(3):Eu super(3+) phosphors synthesized by gel-combustion method

Y sub(2)O sub(3):Eu super(3+) phosphors co-doped with different metal cations (Li super(+), Na super(+), K super(+), Mg super(2+), Ca super(2+)) are prepared by the gel-combustion method with Y sub(2)O sub(3), Eu sub(2)O sub(3), and R(NO sub(3)) sub( x) (R = Li, Na, K, Mg, Ca) serving as raw materials and glycine as fuel, calcined at 1000 degree C for 2 h. The synthesized Y sub(2)O sub(3):Eu super(3+) phosphors doped with different metal cations and doping ratios are characterized by x-ray diffractometry (XRD), fluorescence and phosphorescent spectrophotometer. The co-doping metal cations are advantageous to the development of Y sub(2)O sub(3):Eu super(3+) lattice. All the samples can emit red light peaked at 611 nm under 254-nm excited. The luminescence intensities of co-doping samples are increased because the cations increase the electron transition probability of Eu super(3+) from super(5)D sub(0) level to super(7)F level. The fluorescence lifetime of Eu super(3+) ( super(5)D sub(0) arrow right super(7)F sub(2)) is increased by doping metal cations.