Abstract
Europium ion doped strontium aluminate (SrAlxOy:Eu2+,Dy3+) blue-green phosphors were obtained at low temperatures (500 °C) by the solution—combustion of corresponding metal nitrate–urea solution mixtures, within 5–10 min. In this study the effect of a variation in the Sr:Al molar ratios on the product properties were investigated. The product’s particle size as determined with the PHI 700 Nanoprobe varied between 50 nm (nanorods) and 0.2 µm (hexagonal platelets). X-ray diffraction (XRD) indicated that the hexagonal phase formed for the lower Sr:Al ratios and the monoclinic phase for the higher relative ratios. EDS (electron diffraction spectroscopy) confirm the change in relative Sr:Al ratios and also confirm the presence of the Eu and Dy dopands. Photoluminescence (PL) spectra revealed that europium ions were present in divalent and trivalent oxidation states. It was observed that the Sr:Al molar ratio significantly affects the crystalline structure of the material, the type of luminescence centers present, the ratio of Eu2+:Eu3+ ions and the maximum luminescent intensity of the broad emission bands.
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