Abstract
We report red and green upconversion luminescence in high-silica luminous glass under irradiation by an infrared femtosecond laser. The luminous glasses were fabricated from sintered porous glass impregnated with the rare earth ion Eu3+ or Tb3+. The luminescent spectra under femtosecond laser excitation reveal that the red and green upconversion luminescence results mainly from the transitions 5D0 → 7F2 in Eu3+ and 5D4 → 7F5 in Tb3+. The dependence of the fluorescence intensity on the pump power indicates that the conversion of infrared radiation to visible emission is dominated by two- and three-photon excitation processes, respectively. It is suggested that the upconversion mechanism is simultaneous absorption of two or three infrared photons, which shifts the Eu3+ and Tb3+ ions to their excited states; they quickly cascade down to the lowest excited states. Thereafter, the Eu3+ and Tb3+ ions relax radiatively to their ground states, creating bright red and green fluorescence.
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