Alkaline-Earth Metal Hydrides as Novel Host Lattices for EuII Luminescence
Alkaline-Earth Metal Hydrides as Novel Host Lattices for EuII Luminescence
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DOI：
10.1021/ic200801x
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发表时间：
2011-07-04
影响因子：
4.6
通讯作者：
Springborg, Michael
中科院分区：
文献类型：
--
作者：
Kunkel, Nathalie;Kohlmann, Holger;Springborg, Michael
首次在金属氢化物中研究了二价铕的发光。发现了伪二元系统EuxSr1-xH2的完整固溶体系列[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]。铕浓度较低 (x = 0.005) 的掺铕碱土氢化物 EuxM1-xH2 (M = Ca, Sr, Ba) 表现出最大发射波长为 764 nm (M = Ca)、728 nm (M = Sr) 和 750 nm (M = Ba) 的发光；即，与氟化物或氧化物的发射能量相比，二价铕的发射能量显示出极大的红移。理论计算（LDA+U）证实带隙随着固溶体铕含量的增加而减小。
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.