Alkaline-earth metal hydrides as novel host lattices for Eu(II) luminescence |
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Authors: | Kunkel Nathalie Kohlmann Holger Sayede Adlane Springborg Michael |
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Affiliation: | FR 8.1 Fachrichtung Chemie, Universita?t des Saarlandes, Postfach 151150, 66041 Saarbru?cken, Germany. |
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Abstract: | Luminescence of divalent europium has been investigated for the first time in metal hydrides. A complete solid-solution series was found for the pseudobinary system Eu(x)Sr(1-x)H(2) [a = 637.6(1) pm -12.1(3)x pm, b = 387.0(1)-6.5(2)x pm, c = 732.2(2)-10.1(4)x pm]. Europium-doped alkaline-earth hydrides Eu(x)M(1-x)H(2) (M = Ca, Sr, Ba) with a small europium concentration (x = 0.005) exhibit luminescence with maximum emission wavelengths of 764 nm (M = Ca), 728 nm (M = Sr), and 750 nm (M = Ba); i.e., the emission energy of divalent europium shows an extremely large red shift compared to the emission energies of fluorides or oxides. Theoretical calculations (LDA+U) confirm decreasing band gaps with increasing europium content of the solid solutions. |
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