Femtosecond laser excited up-conversion luminescence from tungsten (molybdenum) ions doped silicate glasses

摘要

Blue emission at 468 nm has been observed in tungsten ions doped Na_20-CaO-Si0_2 glasses excited by 800nm femtosecond laser. The similar emission at 500nm was also observed in molybdenum ions doped silicate glasses. The intensity of emission depends on the power of femtosecond laser, which indicates that the upconversion emission is a two-photon-excited process. This emission is mainly due to the charge transfer between the 2p orbital of 0~(2-) ions and the nd~O energy level of W~(6+) (Mo~(64)) ions in W0_4~(2-) (Mo0_4~(2-)) tetrahedron.