Influence of Scattering Enhancement Particles CaCO3, CaF2, SiO2 and TiO2 on Color Uniformity of White LEDs
Nguyen Huu Khanh Nhan, Tran Hoang Quang Minh, Nguyen Doan Quoc Anh
DOI: 10.15598/aeee.v14i5.1884
Abstract
In this paper, the influence of scattering enhancement particles CaCO3, CaF2, SiO2 and TiO2, adding to YAG:Ce phosphor compounding, on color uniformity of white LEDs (W-LEDs) was presented. Firstly, the physical model of multi-chip W-LEDs is simulated and demonstrated by using commercial LightTools 8.1.0 program. After that, the influence of scattering enhancement particles on color uniformity is calculated and analyzed. With using the Monte Carlo simulation and the Mie-scattering theory, the color uniformity improvement of an 8500 K W-LEDs is demonstrated convincingly. From the researched results, the best color uniformity can be accomplished with TiO2 particles. The results and discussions provided a practical approach for higher-quality manufacturing W-LEDs.