In order to improve the brightness of the white LED light source and reduce the impact of the sudden drop in LED efficiency, the blue ray LD can be used to excite pc-WLED. Then, we studied the relationship between fluorescent ceramic sheets and reflective substrates, and the performance of different-doping fluorescent ceramic sheets. The fluorescent ceramic sheets were packaged. The performance was compared. Finally, different doping fluorescent ceramic sheets were assembled into the RC laser module for comparison. The results show that GaN blue LED chip is a very ideal reflection substrate, and the most suitable fluorescent ceramic for lighting is 4xAl₂O₃+(Ce_0.01Y_0.93Gd_0.06)₃Al₅O₁₂, because of its high alumina content and good thermal conductivity. The fluorescent ceramic can not only further improve the brightness of white LED light source, but also reduce the impact of LED efficiency drop.