Y2O3:Eu3+ phosphor: a novel solution for an increase in color rendering index of multi-chip white LED packages

In this study, a novel compound is synthesized by adding the red-emitting Y2O3:Eu3+ dopant to conformal phosphor package (CPP) or in-cup phosphor package (IPP), to be employed as a component in multi-chip white LEDs lamps (W-LEDs). It was found that this solution can enhance the color rendering index (CRI) of W-LEDs that have correlated color temperatures of 5600K through 8500K to more than 86. Besides, the impacts of the Y2O3:Eu3+ phosphor on the attenuation of light through the phosphor layers, CPP and IPP, are also demonstrated based on the Beer-Lambert law and Mie theory. These results provide important information for producing W-LEDs with higher CRI.