Tunable full-color emitting BaMg₂Al₆Si ₉O₃₀:Eu²⁺, Tb³⁺, Mn²⁺ phosphors based on energy transfer

A series of single-phase full-color emitting BaMg₂Al ₆Si₉O₃₀:Eu²⁺, Tb³⁺, Mn²⁺ phosphors has been synthesized by solid-state reaction. Energy transfer from Eu²⁺ to Tb³⁺ and Eu²⁺ to Mn ²⁺ in BaMg₂Al₆Si₉O₃₀ host matrix is studied by luminescence spectra and energy-transfer efficiency and lifetimes. The wavelength-tunable white light can be realized by coupling the emission bands centered at 450, 542, and 610 nm ascribed to the contribution from Eu²⁺ and Tb³⁺ and Mn²⁺, respectively. By properly tuning the relative composition of Tb³⁺/Mn²⁺, chromaticity coordinates of (0.31, 0.30), high color rendering index R _a = 90, and correlated color temperature (CCT) = 5374 K can be achieved upon excitation of UV light. Thermal quenching properties reveal that BaMg₂Al₆Si₉O₃₀: Eu²⁺, Tb³⁺, Mn²⁺ exhibits excellent characteristics even better than that of YAG:Ce. Our results indicate our white BaMg₂Al ₆Si₉O₃₀:Eu²⁺, Tb³⁺, Mn²⁺ can serve as a key material for phosphor-converted light-emitting diode and fluorescent lamps.