Abstract
Tetragonal Yb3+/Er3+/Tm3+ tri-doped AgGd(W,Mo)2O8 phosphors were prepared by the high-temperature solid-state method. When the phosphors were excited at 980nm, the UC emission of blue at 475nm, green at 525 and 550nm, and red at 656nm were corresponding to the 1G4→3H6 transition of Tm3+ ions, the 2H11/2,4S3/2→4I15/2 transitions of Er3+ ions, and the 4F9/2→4I15/2 transition of Er3+ ions, respectively. The blue UC emissions originate from a three-photon mechanism, while the green and red ones of Er3+ from two-photon process. The UC emission color of the Yb3+/Er3+/Tm3+ tri-doped AgGdW2O8 samples switched from green to white, and then to red depending on the concentrations of Er3+ and Tm3+. After doping with Mo(VI), tetragonal AgGdW2O8 was transformed into tetragonal AgGdMo2O8, resulting in a slightly enhanced UC luminescence intensity with the favor of the red emission of Er3+ ion.
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