Abstract
A novel red emitting phosphor, Eu 3+-doped Sr 2SnO 4, was prepared by the solid-state reaction. X-ray powder diffraction (XRD) analysis confirmed the formation of Sr 2SnO 4:Eu 3+. Field-emission scanning electron microscopy (FE-SEM) observation indicated a narrow size distribution of about 500 nm for the particles with a spheric-like shape. Photoluminescence measurements showed that the phosphor exhibited bright red emission at about 615 nm under UV excitation. The excellent luminescence properties make it possible as a good candidate for plasma display panels (PDP) application. Splitting of the 5D 0– 7F J transitions of the Sr 2SnO 4:Eu 3+ samples suggests that the Eu 3+ ions occupy two nonequivalent sites in the crystallite by substituting Sr 2+ and Sn 4+ ions. The luminescence lifetime measurement showed a bi-exponential decay, providing another evidence for the existence of two different environments for Eu 3+ ions.
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