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Abstract
ABSTRACT Phosphors of Eu2+-doped BaO-SiO2 compounds composed of a major BaSiO3 phase and a minor Ba2SiO4 phase were synthesized by a solid-state method at 1200°C under CO atmosphere. An enhancement of the photoluminescence of Eu2+ up to 18 times has been achieved by mixing ZnO into the composition. The composition-optimized phosphor emits bright yellow–green luminescence with excitation between 380 and 420 nm, indicating potential of application in AlGaN-based UV-LEDs. Under the similar synthesis and measurement conditions, the emission band of the optimized phosphor is more intense and has stronger red component than that of Ba2SiO4:Eu2+. Our experimental results suggest that the addition of ZnO may retain and stabilize Eu2+ in BaSiO3 crystalline lattice and thus may enhance the 5d-4f luminescence and eliminate Eu3+ 4f-4f transition.
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