a Up-conversion (UC) phosphors Gd2(WO4)3: Er 3+ /Yb 3+ were synthesized by a high temperature solid-state reaction method. The crystal structure of Gd2(WO4)3: 3% Er 3+ /10%Yb 3+ was refined by Rietveld method and it was showed that Er 3+ /Yb 3+ were successfully doped into the host lattice replacing Gd 3+ . Under 980nm laser excitation, intense green and weak red emissions centered at around 532nm, 553nm, and 669nm were observed, which were assigned to the Er 3+ ion transitions of 4 H11/2→ 4 I15/2, 4 S3/2→ 4 I15/2 and 4 F9/2→ 4 I15/2, respectively. The optimum Er 3+ doping concentration was determined as 3mol% when the Yb 3+ concentration was fixed at 10mol%. The pump power study indicated that the energy transfer from Yb 3+ to Er 3+ in Er 3+ , Yb 3+ co-doped Gd2(WO4)3 was a two-photon process, and the related UC mechanism of energy transfer was discussed in detail.
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