Tunable luminescence of Dy~(3+) single-doped and Dy~(3+)/Tm~(3+) co-doped tungsten borate glasses

摘要

RE~(3+) (RE~(3+) = Tm~(3+), Dy~(3+)) ion single and co-doped tungsten borate glasses for white light emitting diodes (LEDs) were prepared by melt quenching method. Emission and excitation spectra of the glasses were measured. The color of luminescence can be tuned by changing the composition of glass matrix or the concentrations of Tm~(3+) and Dy~(3+) ions. White light emission can be achieved from 0.5Dy~(3+) single-doped 15WO_3-25La_2O_3-60B_2O_3 and 0.4Tm~(3+)/1.5Dy~(3+) co-doped 50WO_3-25La_2O_3-25B_2O_3 glasses. In addition, energy transfers between Tm~(3+) and Dy~(3+) were also analyzed. The Dy~(3+)/Tm~(3+) co-doped tungsten borate glasses may be potential candidates for white LED application.