Abstract
We present the near infrared to visible up-conversion photoluminescence in a Sm3+-doped 80B2O3-5Na2O-15Al2O3 glass excited with 804 nm femtosecond laser irradiation via a two-photon simultaneous absorption process. Besides, a bright red long-persistent luminescence can be seen with the naked eye in the dark after the removal of the activating laser. Both the up-conversion and long-persistent luminescence are attributed to the 4G5/2→6HJ/2 (J = 5, 7, 9) transitions of Sm3+. Furthermore, defect centers induced by the femtosecond laser irradiation are experimentally verified using the thermo-luminescence technique. A novel phenomenon associated with these defects is observed that a rewritten process of the traps is approached under the ultraviolet excitation. It infers that the fabrication of optical memory could be realized with ultraviolet energy.
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