Intense visible fluorescence and energy transfer in Dy~(3+), Tb~(3+), Sm~(3+) and Eu~(3+) doped rare-earth borate glasses

摘要

Tb~(3+)/Dy~(3+) and Eu~(3+)/Sm~(3+) doped rare-earth borate glasses have been synthesized and characterized. Under UV excitation, Dy~(3+), Tb~(3+), Sm~(3+) and Eu~(3+) emit intense yellowish white, green, reddish orange and red lights, respectively. In Tb~(3+)/Dy~(3+) co-doped glasses, the enhancement of Tb3+ green emission is observed, and the sensitization is related to the efficient energy transfer from Tb~(3+)/Dy~(3+) and Eu~(3+)/Sm~(3+) co-doped glasses, the excitation wavelength range of Eu~(3+) emission is broadened owing to the energy transfer from Sm~(3+) to Eu~(3+). This broadening makes the Ar+ 488 nm wavelength laser a powerful excitation source for Eu~(3+) fluorescence. The rare-earth doped glasses with various visible emissions are useful for developing new color light sources, fluorescent display devices, UV-sensor and tunable visible lasers.