Investigating of different arrangement configurations of phosphor particles by using the Finite-Difference Time-Domain method

The optical performance of phosphor-converted light-emitting diodes (pcLEDs) has been widely concerned. However, the phosphor particles are usually randomly distributed in the silicone to convert the blue light into yellow or red light. With the development of the precision printing and 3D printing, the phosphor particles may be precisely arranged in the near future. It indicates that the phosphor converted layer can be designed on the particle level. In order to investigated this aspect, in this work, we simulated the orthogonally and hexagonally staggered phosphor particles by finite difference time domain method. Results show that the electric field strength Poynting vector in the Z-axis direction of orthogonally staggered particles is higher than random arrangement. The output power distribution is more uniform when particles distributed randomly, and there is no obvious difference of output power between hexagonally staggered particles and random particles. But these results of the orthogonally staggered particles are higher obviously than others. These conclusions of this work can be served as a designing reference for manufacturing high-quality WLEDs.