The luminescence of Nd~(3+)-doped in NaBi(WO_4)_2 single crystal was investigated from 10 K to room temperature. The excitation source was a pulsed dye laser in resonance into the (~4G_(5/2)+~2G(1)_(7/2)) levels of Nd~(3+) ions. Several blue emission bands in the up-conversion lu-minescence spectra corresponded to transitions from ~2P_(1/2) to ~4I_(9/2). Some violet bands corresponding to transitions of ~4D_(3/2)→(~4I_(9/2), ~4I_(11/2), ~4I_(13/2)) were also observed. For comparison, the luminescence spectra and decay curves excited by the pulsed 355 nm laser were measured. In order to investigate up-conversion mechanisms, the decay behavior and the dependence of the up-conversion luminescence on laser powers were investigated. The temporal decay behavior of the up-conversion luminescence indicated that the two-photon excited state absorption of the Nd~(3+) ions was the dominant mechanism in this crystal.
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