Mn2+-Si4+ co-doped Al2O3- Ce: (Y, Tb) AG composite ceramic phosphors for high color rendering white LED/LD illumination: an investigation on the luminescence properties and energy transfer mechanism

Nevertheless, pure YAG-based ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb)3Al5O12-Al2O3 composite ceramic phosphors via a solid-state reaction method.

It was observed that the introduction of Mn2+ ions created a secondary luminescence center with an emission peak centered at 580 nm. As the Mn2+ concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb3+ and Mn2+, Ce3+ ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly.