A red-emitting heavy doped phosphor Li 6Y(BO 3) 3:Eu 3+ for white light-emitting diodes

Abstract

A series of Eu 3+ activated Li 6Y 1− x Eu x (BO 3) 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 Li 6Gd(BO 3) 3. The excitation spectra indicate that these phosphors can be effectively excited by near UV (370–410 nm) light. The red emission from transition 5D 0→ 7F 2 is dominant. The emission spectra exhibit strong red performance (CIE chromaticity coordinates: x = 0.65, y = 0.35), which is due to the 5D 0− 7F J transitions of Eu 3+ ions. The relationship between the structure and the photoluminescent properties of the phosphors was studied. The concentration quenching occurs at x ≈ 0.85 under near UV excitation. Li 6Y(BO 3) 3:Eu 3+ has potential application as a phosphor for white light-emitting diodes.