Effect of Tb3+ Doping Concentration on Luminescent Properties of Sr3B2O6 Phosphor

The Sr3B2O6:Tb3+ phosphors with different concentration of Tb3+ were prepared by combustion method combination with heating at high-temperature. Results of the crystalline structure measurement indicate that the Sr3B2O6:Tb3+ phosphors have a Rhomboidal single phase. The excitation spectra show that the phosphors can be excited by ultraviolet light of near 379 nm. The emission spectra under 379 nm excitation includes several narrow lines, which is 5D4-7Fj (j = 2, 3, 4, 5, 6) transitions of Tb3+ ion in the lattice. The emission intensity of Tb3+ in Sr3B2O6 is influenced by the Tb3+ doping content and optimum concentration is 3%mol. The concentration quenching of Tb3+ in this phosphor occurs when Tb3+ concentration is over 3%mol. The concentration quenching mechanism was determined dipole-quadrupole (d-q) interaction by using Dexter’s theory.