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Green-emitting ZnGa 2 S 4 :Eu 2+ phosphors have been synthesized by solid state reaction. Their luminescence properties have been investigated by photoluminescence excitation and emission spectra, concentration quenching, thermal quenching and photoluminescence decay. The critical dopant concentration is found to be 0.05 mol of Eu 2+ and the critical transfer distance of Eu 2+ is calculated as 17 Å. The thermal quenching result suggests that the phosphor does not have good thermal-quenching property. Its chromaticity coordinates are very close to those of SrGa 2 S 4 :Eu 2+ . Because of their broadband absorption in the region 350-520 nm, the ZnGa 2 S 4 :0.05Eu 2+ phosphor can be a good green phosphor candidate for creating white light in phosphor-converted white LEDs, when combined with RB phosphors and a UV LED.