Improvement of optical properties of white led lamps using green-emitting Ce0.67Tb0.33MgAl11O19:Ce,Tb Phosphor


Anh N.D.Q., Long N.N.

Source title

Advanced Structured Materials

Publication year

This study presents the improvement of performance of multi-chip white LED lamps (MCW-LEDs) having average CCTs of 7000 and 8500 K by using green-emitting Ce0.67 Tb0.33 MgAl11O19:Ce,Tb (CeTb) phosphor. The performance includes luminous efficacy and color uniformity which is analyzed based on Mie theory. Effects of CeTb concentration on optical properties of MCW-LEDs are also investigated. Optical simulations are employed by Light Tools software based on Monte Carlo method. Moreover, the scattering enhancement in CeTb case is demonstrated by Mie theory and Matlab soft-ware. The results show that both the luminous efficacy and color uniformity grow with CeTb concentration.