Abstract：The direct sensitization up-conversion processes from Yb3＋ to Ho3+ and Tm3+ in fluoride were studied. The properties of the up-converted spectra of Yb3+/Ho3+ and Ho3+/Yb3+/Tm3+ co-doped fluorides pumped by a 980 nm laser were compared. Their up-conversion mechanism has been analyzed and discussed. Two strong up-conversion luminescence bands have been observed, which were the transitions of 5F45S2(Ho3+)→5I8(Ho3+)in the Yb3+/Ho3+ co-doped fluoride system and 3H4(Tm3+)→3H6(Tm3+) in the Ho3+/Yb3+/Tm3+ co-doped fluoride system. The addition of Tm3+ into Yb3+/Ho3+ co-doped fluoride decreases the up-converted emission intensities of Ho3+ in the visible region.
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