Blue-white-yellow tunable emission from Ce³⁺ and Eu²⁺ Co-doped BaSiO₃ phosphors

Ce³⁺ and Eu²⁺ co-doped BaSiO₃ phosphors simultaneously emit bluish purple and yellow double-color light under the excitation of 335 nm ultraviolet (UV) light. The asymmetric blue-violet emission originates from Ce³⁺, whereas the yellow emission originates from Eu²⁺. The luminescent spectra reveal that an efficient resonance energy transfer can occur from the Ce³⁺ to the Eu²⁺ ions. Based on the principle of energy transfer, the varied emitted color of the phosphors from blue-violet through white and finally to yellow can be achieved by properly tuning the ratio of Ce³⁺Eu²⁺. Results indicate that the present phosphor BaSiO₃:Ce³⁺, Eu²⁺ is one of potential candidates for white light-emitting diodes based on UV light-emitting diodes (LEDs) chip.