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Owing to its excellent yellow light emission, the (Gd,Y)AG:Ce based phosphors have been widely studied. In this paper, the (Gd,Y)3(Al1-xGax)5O12:Ce (x=0.1-0.8) and (Gd,Y)3(Al1-2yMgySiy)5O12:Ce (y=0.05-0.4) phosphors were successfully prepared by coprecipitation and high temperature solid phase method, respectively. The lattice stabilization, microstructure and fluorescence properties were systematically investigated. With increasing the concentration of Ga, the emission peaks of (Gd,Y)3Al5O12:Ga/Ce phosphors displayed a blue-shift from ~575 nm (yellow) to ~549 nm (yellow-green), and the decay time was decreased gradually. However, the emission peaks of (Gd,Y)AG:Mg/Si/Ce phosphors red shifted from ~575 nm (yellow) to ~592 nm (orange-red) with increasing the concentration of Mg/Si, and the decay time change was similar to the former. The underlying mechanisms were thoroughly investigated and elucidated. In addition, the effect of temperature on the fluorescence properties of (Gd,Y)AG:Ce based phosphors was investigated in detail. The (Gd,Y)AG:Ce based phosphors may hopefully meet the requirements of various lighting and optical display applications.

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly