Augmenting color homogeneity and luminous flux of WLEDs with dual-layer structure of the remote phosphor package

This article indicates the impacts of the distance between two phosphor layers (d1) and the distance between the phosphor layer with the LED surface (d2) on the optical properties of the remote phosphor structure. When the distances d1 and d2 are varied, the scattering and absorption properties of the remote phosphor layer change dramatically, which causes a huge influence on the color uniformity and illumination capability of WLEDs. To keep the correlated color temperature of WLEDs stable at 8500 K in case d1 and d2 are adjusted, the concentration of YAG:Ce3+ phosphor also needs to be modified. When d1 = d2 = 0, the scattering and absorption in the remote phosphor layer is minimum, leading…