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http://dx.doi.org/10.4191/KCERS.2011.48.2.183

Effect of Crystal Structural Environment of Pr3+ on Photoluminescence Characteristics of Double Tungstates  

Lee, Kyoung-Ho (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
Chae, Ki-Woong (Department of Materials Science and Engineering, Hoseo University)
Cheon, Chae-Il (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
Kim, Jeong-Seog (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.2, 2011 , pp. 183-188 More about this Journal
Abstract
In this article, the effect of the crystal structural environment of $Pr^{3+}$ ions on the photoluminescence (PL) characteristics of double tungstates, such as $A(M_{1-X}Pr_X)W_2O_8$ (A=Li, Cs, M = In, Y, Sc, La; $0.007{\leq}x{\leq}0.1$) and $La_{1.96}Pr_{0.04}W_3O_{12}$ are characterized. By varying the ion radius in A and M sites, the structural environment of $Pr^{3+}$ ions were modified. The structural criteria, that is, the point charge electrostatic potentials V around the $Pr^{3+}$ activator, were calculated using the crystal structural parameters. The point charge potential V can be a valid criterion for $^3P_o$ quenching in various double tungstates. When the calculated V values are large (> 6.0), the luminescence from the $^3P_0$ level becomes dominant. When the calculated V values are about 3.8, the $^1D_2$ line appears weakly but $^3P_0$-level luminescence is absent. When the calculated V values are small (< 2.0), the luminescence from the $^1D_2$ level becomes dominant and $^3P_0$-level luminescence is absent. At 2.0 quenching to $^1D_2$ level occurs substantially in accordance with the structural criterion of the point charge potential model.
Keywords
$Pr^{3+}$ activator; Double tungstate; Solid-state reaction; X-ray methods; PL characteristics; Point charge potential; Structural environment;
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