A red-emitting heavy doped phosphor Li6Y(BO3)3:Eu3+ for white light-emitting diodes

A series of Eu3+ activated Li6Y1-xEux(BO3)(3) (0.05 <= x <= 1) phosphors were synthesized by solid-state reaction method. The structures and photoluminescent properties of the phosphors were investigated at room temperature. The results of XRD patterns indicate that these phosphors are isotypic to the monoclinic Li6Gd(BO3)(3). The excitation spectra indicate that these phosphors can be effectively excited by near UV (370-410 nm) light. The red emission from transition D-5(0)-> F-7(2) is dominant. The emission spectra exhibit strong red performance (CIE chromaticity coordinates: x = 0.65, y = 0.35), which is due to the D-5(0)-F-7(J) transitions of Eu3+ ions. The relationship between the structure and the photoluminescent properties of the phosphors was studied. The concentration quenching occurs at x approximate to 0.85 under near UV excitation. Li6Y(BO3)(3):Eu3+ has potential application as a phosphor for white light-emitting diodes. (C) 2011 Elsevier B.V. All rights reserved.