Effect of Nonstoichiometry on the Deterioration of Eu2+-Doped Hexagonal Aluminate Phosphor for Plasma Display Applications

概要

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The luminescence properties of blue phosphors 0.9BaO$\cdot$0.1EuO$\cdot$MgO$\cdot$$m$Al2O3 with $m=3.5$ to 8.0 were investigated for color plasma display panel (PDP) applications. The deterioration properties of the phosphors baked in air and irradiated under vacuum ultraviolet (VUV) rays were systematically studied with different alumina contents $m$. The results indicate that the phosphor with $m=5.0$ shows a relatively more stable color chromaticity after the baking process and VUV irradiation, whereas the phosphors with $m=5.5$ to 8.0 show small decreases in the emission intensity compared to the phosphor with $m=5.0$ after VUV irradiation. These decreases in the emission efficiency are ascribed to the irregular order of the Eu2+ ions in the intermediate layer and the shifts of the chromaticity coordinates to the changes of the Eu2+ sites, which are suggested to occupy unstable Beevers–Ross and/or mid-oxygen sites in the host.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
2003-02-15