Microstructure and photoluminescent properties of BaY2ZnO5:Tb3+ phosphors with addition of lithium carbonate

Abstract

Abstract In this paper, Tb 3+ activated BaY 2 ZnO 5 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 BaY 2 ZnO 5 :Tb 3+ phosphors to which lithium carbonates were added were sintered at 1250 °C for 12 h, X-ray powder diffraction analysis showed that the un-reacted Y 2 O 3 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 BaY 2 ZnO 5 :Tb 3+ phosphors. The green emission of the BaY 2 ZnO 5 :Tb 3+ , Li + phosphors showed the CIE chromaticity coordinates in the range of x = 0.3361–0.3510 and y = 0.5202–0.5492.