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Ce 3+ /Er 3+ /Bi 3+ triply-doped yttrium aluminum garnet (YAG) is synthesized using co-precipitation method. The Bi 3+ concentration-dependent near-infrared (NIR) emission behavior is systemically investigated. The NIR emission of Er 3+ ions at 1531 nm is enhanced threefold by the addition of 7 mol% Bi 3+ . Bi 3+ doping results in the formation of exciton in YAG and the variation in the local environment of the doped rare-earth ions. The enhancement in NIR luminescence is ascribed to the combined effects of the sensitization of exciton→Ce 3+ →Er 3+ and the Bi 3+ doping-induced adjustment of the local environment for Ce 3+ and Er 3+ ions.

The title phosphor is synthesized by a two‐stage solid state reaction of SrCO3, Al2O3, SrSO4, Li2CO3, Eu2O3, and Er2O3 (calcination at 1200—1250 °C for 8 h followed by annealing at 900—1100 °C under reducing atmosphere).