Preparation of YAG: Ce yellow phosphor by step-by-sty precipitation method

The high-brightness LED with (Y_0.98-xGd_xCe_0.02)₃Al₅O₁₂ yellow phosphor is be obtained by step-by-sty precipitation method, and used the 0.1 mol/L ammonium bicarbonate and aqueous ammonia to be precipitant. The effect of Gd³⁺ concentration on (Y_0.98-xGd_xCe_0.02)₃Al₅O₁₂ is investigated at room temperature(RT). The results show that, the relative intensity increased with increasing content of Ce,and achieve the maximum value at x = 0.06, then followed by weakening trend, the intensity of phosphors that adding flux increased by 50%, the peak wavelength changed about 5 nm to 10 nm by addition of Gd³⁺ from 0 to 0.3 mol and optimal luminescent intensity happens at 0.1 mol Gd³⁺ doping. The experiment results proved that the phosphors remain structure of Y₃Al₅O₁₂ phase when the Gd³⁺ doping.