Mixed Anionic Metal Hydrides as Host Lattices for the Luminescence of Divalent Europium

混合阴离子金属氢化物作为二价铕发光的主体晶格

• 批准号: 419433503
• 负责人: Professor Dr. Holger Kohlmann
• 金额: --
• 依托单位: Institut für Anorganische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/419433503?language=en
• 关键词: Mixed; Anionic; Metal; Hydrides; Host

Divalent europium, Eu(II), in inorganic host lattices is of great interest for applications in lighting devices. In oxide based compounds and in halogenides, it usually shows blue or green emission upon excitation with UV light (photoluminescence). With more polarizable ligands, such as nitrides or hydrides, the emission shifts to yellow, orange or red. By investigating mixed anionic hydridic host materials, we want to systematize the influence of dopant concentration, bond length, number of hydride ligands, mixing of hard and soft anions, coordination number and symmetry on luminescence properties. These materials will be doped with different amounts of europium (0.1-2%) and characterized by X-ray diffraction, neutron diffraction and luminescence spectroscopy, including very high resolution spectra, low temperature and measurements of lifetime. Hydridic host materials will be from various classes of mainly ionic mixed anionic metal hydrides, e. g. perovskite-type hydride fluorides KCaH3-xFx (1 < x < 3), pyrochlore-type hydride fluorides and hydride oxides NaCaMg2F7-xHx, NaSrMg2F7-xHx, KCaNb2O6F1-xHx, and KCaTa2O6F1-xHx, hydride halogenides MHX (M = Ca, Sr, Ba; X = Cl, Br, I), lanthanide hydride oxides LnHO, and hydride silicates. Identifying and quantifying the crystal chemical key parameters for Eu(II) luminescence in such compounds will enable us to make predictions for the ideal chemical environment around europium atoms for a chosen emission wavelength, to suggest suitable crystal structures and thus the knowledge-driven development of luminescence materials. This will provide a deep understanding of Eu(II) luminescence in mixed-anionic metal hydrides at a level, where it can be used as a guide for the search of new luminescence materials.

无机主晶格中的二价铕 (Eu(II)) 在照明设备中的应用引起了极大的兴趣。在氧化物基化合物和卤化物中，通常在紫外光激发（光致发光）时显示蓝色或绿色发射。对于更具极化性的配体，例如氮化物或氢化物，发射光会变成黄色、橙色或红色。通过研究混合阴离子氢化主体材料，我们希望系统化掺杂剂浓度、键长、氢化物配体数量、硬阴离子和软阴离子的混合、配位数和对称性对发光性能的影响。这些材料将掺杂不同量的铕（0.1-2%），并通过 X 射线衍射、中子衍射和发光光谱进行表征，包括极高分辨率光谱、低温和寿命测量。氢化主体材料将来自各种类别的主要离子混合阴离子金属氢化物，例如氢化物。 g。钙钛矿型氢化物氟化物 KCaH3-xFx (1 < x < 3)、烧绿石型氢化物氟化物和氢化物氧化物 NaCaMg2F7-xHx、NaSrMg2F7-xHx、KCaNb2O6F1-xHx 和 KCaTa2O6F1-xHx、氢化物卤化物 MHX (M = Ca, Sr ，X； = Cl、Br、I)、镧系元素氢化物氧化物 LnHO 和氢化物硅酸盐。识别和量化此类化合物中铕（II）发光的晶体化学关键参数将使我们能够预测选定发射波长下铕原子周围的理想化学环境，提出合适的晶体结构，从而促进知识驱动的开发发光材料。这将在一定程度上加深对混合阴离子金属氢化物中Eu(II)发光的理解，为寻找新的发光材料提供指导。