Investigation on Eu/Tb activated photoluminescent properties of Li3Sc(BO3)2 based phosphors

Taking Li3Sc(BO3)(2) as host, a series of Eu3+/Tb3+ singly-doped and co-doped phosphors were synthesized through conventional solid-state reaction method. The phase assemblage and purity of as-prepared phosphors were investigated by analyzing their powder X-ray diffraction (XRD) patterns. The VUV-UV excited luminescence properties of a series of Eu3+/Tb3+ doped Li3Sc(BO3)(2) phosphors were investigated in detail, with decay lifetime, chromaticity coordinate and mechanism of the phosphors analyzed. The luminescence decay lifetimes of Eu and Tb are both on a millisecond timescale. The chromaticity coordinates indicate that Li3Sc(BO3)(2): 0.01Eu phosphor has a deep reddish orange-red emission and Li3Sc(BO3)(2): 0.01Tb phosphor has a bright green emission. The Li3Sc(BO3)(2): EuxTby phosphors can generate bright color-tunable green-yellow-red light by changing the doping concentration. With increasing Eu3+ concentration, the emission colors of Li3Sc(BO3)(2): 0.01Tb(3+), xEu(3+) phosphors can be appropriately tuned from green to yellow (lambda(ex) = 243 nm) and yellow to orange-red (lambda(ex) = 252 nm), respectively. Under the excitation of near-ultraviolet light 243 and 252 nm, emission colors of Li3Sc(BO3)(2): 0.01Eu(3+), xTb(3+) phosphors can be tuned from yellow-green to green with increasing Tb3+ concentration. (C) 2017 Elsevier B.V. All rights reserved.