Abstract: YAG∶ Ce phosphor was synthesized by citric acid-gel method. The effects of spectrum intensity of the concentration (x) of Ce ion and calcination temperatures were studied.The result indicates that spectrum intensity of phosphor increases with the concentration (x) of Ce ion when x is less than 0.07, the spectrum intensity of phosphor decreases with the increase of x when x is more than 0.07.The crystallinity of powders and spectrum intensity of YAG∶ Ce phosphor increase with the increasing of calcination temperatures. It is also found that parameters such as temperatures and x do not affect the peak shape and peak locations, the main excitation peak locates at 469 nm and the main emission peak locates at 529 nm .

Key words: YAG∶ Ce phosphor%citric acid-gel method%Ce ion concentration%calcination temperatures%excitation spectrum