Microstructure and photoluminescent properties of BaY 2 ZnO 5 :Tb 3+ phosphors with addition of lithium carbonate

In this paper, Tb3+ activated BaY2ZnO5 phosphors with addition of lithium carbonates (0, 0.0125, 0.025, 0.05, 0.1, and 0.2 molar ratio) were synthesized using the solid-state reaction, and the morphology and photoluminescent properties are investigated. When BaY2ZnO5:Tb3+ phosphors to which lithium carbonates were added were sintered at 1250 degrees C for 12h, X-ray powder diffraction analysis showed that the un-reacted Y2O3 raw material decreased and scanning electron microscopy showed that the grain growth is improved. From PL studies, the photoluminescent properties were decreased when Li+ ion was added, which might be resulted from the increase of the oxygen vacancy in BaY2ZnO5:Tb3+ phosphors. The green emission of the BaY2ZnO5:Tb3+, Li+ phosphors showed the CIE chromaticity coordinates in the range of x=0.3361-0.3510 and y = 0.5202-0.5492. (C) 2013 Elsevier B.V. All rights reserved.