Single-Phase White Light-Emitting Ca Ba_(9-Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ Phosphors

Single-phase white light-emitting Ca Ba_(9-Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ codoped phosphors were successfully synthesized, and their photoluminescence properties were experimentally determined. The analysis of the experimental results suggests that the partial substitution of Ba²⁺ ions by smaller Ca²⁺ ions alters the distribution of the Eu²⁺ luminescence center among the three available Ba²⁺ sites in the host lattice, which enables the emission to be efficiently tuned from blue to blue-green-yellow region. The incorporation of Mn²⁺ ions resulted in a red light emission at around 618 nm, through energy transfer from Eu²⁺ to Mn²⁺ ions via dipole-dipole interactions. The incorporation of Ca²⁺ and Mn²⁺ ions also resulted in improved thermal stability. The results qualify the produced Ca Ba_(9-Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ composition as a potential ultraviolet-convertible white light-emitting phosphor.