To improve the color rendering index (CRI) of white LEDs ,we fabricated white light LED samples of 0#－4#,by putting 0.0mg,1.0mg,3·0mg,4.0mg,5.5mg Ru(dtb-bpy)3.2(PF6) THF solution on the YAG powder coating of the conservative white light LED.We tested the emitting specra,color rending index and other parameters of these samples.The results show that the white LED can excite th e Ru(dtb-bpy)3·2(PF6) materials.With the increase of the content of the Ru(dtb-bpy)3·2(PF6),the radiation intensity of blue-chip is weakened graduall y,but the phosphor spectra present intensity attenuation and red shift.Moreove r,we obtain the white light LED with the highest color rendering index of 84.5whil e putting 4.0mg Ru(dtb-bpy)3·2(PF6) THF solution on the YAG powder coating of the conservative white light LED,and the color rendering index increases by 13% compared with that of the conservative white light LED,but the luminous efficien cy shows attenuation to some extent.