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

A series of color tunable green white emitting Li3Ba2Y2.9-yTb0.1Euy(WO4)(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, Tb3+-Eu3+ co-doped Li3Ba2Y3(WO4)(8) phosphor emits a white light, consisting of three typical emission bands of blue from substrate, green from Tb3+ and red from Eu3+. The luminescent colors can be tuned by adjusting the relative doping ratios of Tb3+ and Eu3+ in Li3Ba2Y3(WO4)(8) phosphor, leading to the changes in spectral components. The integrated emission intensities of Li3Ba2Y2.7Tb0.1Eu0.2(WO4)(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 Li3Ba2Y2.9-yTb0.1Euy(WO4)(8) phosphor may have a potential application for white LEDs. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.