Study on （Y, Gd）3（Al, Ga）5O12：Ce^3＋ Phosphor

(Y1-a,Gda ) 3 - x (Al1-b, Gab) 5O12 : Cex^3 was synthesized by high-temperature solid state reaction in reducing atmosphere based on high purity raw materials. The influences of y^3 , Gd^3 , A1^3 , Ga^3 and activator-Ce^3 on the performance of the phosphor were investigated. Ce^3 is the luminescent center and activates the phosphor after it replaces Y partially. When x is less than 0.12, the volume of the crystal and the emission intensity of the phosphor increase with the quantity of Ce^3 . When CeO2 is added too much, the phase CeAlO3 will appear. The excitation and emission peaks of the phosphor will shift to longer wavelength when the amount of Gd^3 increases. The wavelength of the emission peak can shif tabout 20 nm when a equals 0.45. In opposite, the excitation and emission peaks will shift to shorter wavelength, when part of Al^3 is replaced by Ga^3 . The wavelength of the emission peak can shift about 20 nm when b equals 0.55.Through the replacemeat of Y^3 or Al^3 by Gd^3 or Ga^3 , the emission peak of the phosphor can be adjusted from 520 to 560 nm. In this way, the phosphor is more suitable for different chips.