Development of Mn^<2+> Activated Ba-Sr-Mg-aluminate Green Phosphors for PDPs

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BaAl_<12>O_<19> is considered to be a mixture of a Ba-poor aluminate (0.82BaO・6Al_2O_3 ) and a Ba-rich aluminate (xBaO・6Al_2O_3, X=1.30±0.2). Because the Ba-poor aluminate and BaMgAl_<10>O_<17> (BAM) have exactly the same crystal structure as β-alumina, both compounds form solid solutions with it. In this study, we prepared various kinds of solid solutions of the Ba-poor aluminate and BAM in which Mn^2+> was substituted for some or all of the Mg^<2+>. These formulae can be expressed as (1-α)(0.82BaO-6Al_2O_3)・α(BaMg_<1-β>Mn_βAl_<10>O_<17>). Their emission properties under 146 nm excitation were studied. As α and β were changed with a constant Mn^<2+> content in the phosphor (α・β=0.12), two kinds of bright solid solutions were found. One was a BAM-poor solid solution (α=0.12, β=1.0) and the other was a BAM-rich solid solution (α=0.92, β=0.13). Substituting Sr^<2+> for Ba^<2+> improved the luminance of the BAM-rich solid solution. For example, the composition of a BAM-rich solid solution in which Sr^<2+> replaced 76% of the Ba^<2+> was Ba_<0.24>Sr_<0.75>Mg_<0.80>Mn_<0.12>Al_<10.2>O_<17.21・ Comparing the properties of this phosphor with those of the conventional BaAl_<12>O_<19>:Mn, we found the luminance was 18% higher, the chromaticity was purer green (x=0.146, y=0.749) and the 1/10 decay time was equivalent (14 ms). This material should serve as a new green phosphor for PDPs, though its lifetime in PDPs remains to be measured.
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Development of Mn^<2+> Activated Ba-Sr-Mg-aluminate Green Phosphors for PDPs

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