Alkaline-Earth Metal Hydrides as Novel Host Lattices for Eu-II Luminescence

作者：Kunkel Nathalie; Kohlmann Holger^*; Sayede Adlane; Springborg Michael

来源：Inorganic Chemistry, 2011, 50(13): 5873-5875.

DOI：10.1021/ic200801x

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 EuxSr1-xH2 [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 EuxM1-xH2 (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.

• 出版日期2011-7-4