Silica particles: an innovative recommendation for enhancing the color uniformity and illuminance efficacy of multi-chip white LED lamps

In this paper, the effect of silica particle (SiO2) concentration on color and illuminance uniformity of a multi-chip white LEDs (MCW-LEDs) with the correlated color temperature (CCT) near 8500 K is presented and analyzed. It is suggested that the novel phosphor silicone layer (PSL), which is added by silica particles, can improve the uniformity of color correlated temperature (CCT) and illumination. By using LightTools simulation program based on Monte Carlo method, the novel PSL enables the reduction of the CCT deviation (Delta CCT) from 2200 K to 1700 K, while the illuminance uniformity increases from 0.32 to 0.35. The simulation results could be totally proved by Mie theory. This research proposes a prospective approach for high quality manufacturing MCW-LED in the near future.