Y2.94−xAl5O12(YAG):Ce0.06Prxphosphors with various Pr3+concentrations (x=0, 0.006, 0.01, 0.03, 0.06, and 0.09) were synthesized by using a coprecipitation method. The phases, luminescent properties, and energy transfer phenomenon from Ce3+to Pr3+were investigated. The results indicated that the doping of Pr3+ (x≤0.09)did not produce any new phases but caused a slight lattice parameters increase. After Pr3+doping, the YAG:CePr phosphor emits red light at 610 nm, which was regarded helpful for improving the colour rendering index of the phosphor. With Pr3+concentration increase from 0.006 to 0.01 mol, the intensity of red light emission increased slightly; further increasing Pr3+concentration from 0.01 to 0.09, the red light emission intensity decreased gradually. Excitation at 340, and 460 nm could not lead to the direct electronic excitation of Pr3+ions; however, when YAG:CePr was excited at 340 nm a red light emission at 610 nm appeared, which implied the energy transfer phenomenon from Ce3+to Pr3+.
214 Three-Dimensional Scanless CT measurement of Light Emission Intensity Distribution of a Premixed Flame
