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In the last three decades, light emitting diodes (LEDs) had a huge improvement in technical implication due to its excellent advantages such as long lifetime, compactness, high luminous efficiency, environment factor, and low cost. In this paper, the improvement of optical properties (color rending index and color quality scale) of the white LEDs by adding scattering enhancement particles CaCO3, CaF2, SiO2, and TiO2 to the yellow-emitting YAG:Ce phosphor compounding was investigated. In the beginning, we built the physical model of multi-chip W-LEDs (MCW-LEDs) by using commercial LightTools 8.1.0 program. After that, we investigated, calculated and analyzed the influence of scattering enhancement particles on the color rending index (CRI) and color quality scale (CQS) of MCW-LEDs. Finally, the results were demonstrated the Mie-scattering theory with using the Mat lab software. The results indicated that all CaCO3, CaF2, SiO2 and TiO2 particles are influenced by the optical properties of MCW-LEDs. The highest CRI and CQS of W-LEDs can be obtained by adding CaCO3 particles. This results and discussion provided important technical implication for materials development of MCW-LED applications.

international journal on electrical engineering and informatics

Influence of CaCO 3 , CaF 2 , SiO 2 , and TiO 2 Scattering Particles’ Concentration on Color Rending Index and Color Quality Scale of the Conformal Packaging Multi -chip White LEDs