Study on photoluminescence properties of Ce-doping YAG fluorescent ceramics packaging white LED

Using the optical analysis software ASAP,the photoluminescence properties about Ce3+-doping YAG fluorescent ceramics are simulated.The results show that for a given Ce3+-doped density,with the increasing of the thickness of the fluorescent ceramics,the luminous flux of the white LED packaged by Ce3+-doping YAG fluorescent ceramics first increases and then decreases,whereas the correlated color temperature gradually decreases and then keeps a low value. The color coordinates keeps increasing to the yellow area in the CIE.There exists an optimal thickness of the fluorescent ceramics,resulting in the maximum luminous efficiency.Meanwhile,the optimal thickness of the fluorescent ceramics decreases with the increasing of the Ce3+-doped density.With the increasing of the packaging distance of the fluorescent ceramics to the LED chip,the luminous flux,color coordinates and efficiency of the white LED gradually increase,while the correlated color temperature gradually decreases,and the light of LED trends warm.