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Abstract
In this work, we have investigated the photoluminescence spectra of europium-doped zinc oxide crystallites prepared by a vibrating milled solid-state reaction method. X-ray diffraction, scanning electron microscopy, luminescence spectra and time-resolved spectra analysis were used to characterize the synthetic ZnO:Eu 3+ powders. XRD results of the powders showed a typical wurtzite hexagonal crystal structure. A second phase occurred at 5 mol% Eu 2O 3-doped ZnO. The 5D 0– 7F 1 (590 nm) and 5D 0– 7F 2 (609 nm) emission characteristics of Eu 3+ appeared after quenching with more than 1.5 mol% Eu 2O 3 doping. The Commission Internationale d’Eclairage (CIE) chromaticity coordinates of a ZnO:Eu 3+ host excited at λ ex=467 nm revealed a red-shift phenomenon with increase in Eu 3+ ion doping. The lifetime of the Eu 3+ ion decreased as the doping concentration was increased from 1.5 to 10 mol%, and the time-resolved 5D 0→ 7F 2 transition presents a single-exponential decay behavior.
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