Color tunable luminescence in novel Li3Ba2Y3(WO4)8:Tb3+, Eu3+ phosphor for white LEDs

Abstract A series of color tunable green–white emitting Li 3 Ba 2 Y 2.9− y Tb 0.1 Eu y (WO 4 ) 8 phosphors was synthesized via a conventional high-temperature solid-state reaction method. Photoluminescence (PL) spectra have demonstrated that under the excitation of 290 nm, Tb 3+ –Eu 3+ co-doped Li 3 Ba 2 Y 3 (WO 4 ) 8 phosphor emits a white light, consisting of three typical emission bands of blue from substrate, green from Tb 3+ and red from Eu 3+ . The luminescent colors can be tuned by adjusting the relative doping ratios of Tb 3+ and Eu 3+ in Li 3 Ba 2 Y 3 (WO 4 ) 8 phosphor, leading to the changes in spectral components. The integrated emission intensities of Li 3 Ba 2 Y 2.7 Tb 0.1 Eu 0.2 (WO 4 ) 8 phosphor under the excitation of 290 nm decreased to 73% of the initial intensities at room temperature after the temperature was increased to 393 K, which indicates that this phosphor has a good thermal stability. The above results indicate that Li 3 Ba 2 Y 2.9− y Tb 0.1 Eu y (WO 4 ) 8 phosphor may have a potential application for white LEDs.