GaYAG green fluorescent powder, synthetic method thereof and luminescent device

The invention belongs to the field of fluorescent powder, and particularly relates to GaYAG green fluorescent powder, a synthesis method thereof and a luminescent device. The preparation method comprises the following steps: precipitating a mixed solution system of gallium salt, aluminum salt, yttrium salt and cerium salt through a coprecipitation method to obtain a coprecipitate; carrying out aging treatment on the co-precipitate, adding a surfactant, emulsifying, dispersing and drying to obtain a dried co-precipitate; and carrying out high-temperature reduction reaction on the dried coprecipitate in the presence of carbon to obtain the GaYAG green fluorescent powder. The GaYAG green fluorescent powder obtained by the synthesis method provided by the invention has a central particle size of about 22-26 [mu] m, and has high luminous flux and high thermal stability at the same time, and a light-emitting device prepared from the GaYAG green fluorescent powder is high in yield, stable in performance and low in c