Colis Julie Clarissa F, Larochelle Christie, Fernández Eduardo J, López-de-Luzuriaga José M, Monge Miguel, Laguna Antonio, Tripp Carl, Patterson Howard
Department of Chemistry and Laboratory for Surface Science and Technology, University of Maine, Orono, Maine 04469, USA.
J Phys Chem B. 2005 Mar 17;109(10):4317-23. doi: 10.1021/jp045868g.
The excited-state properties of the layered LaAg(CN)(2) and LaAu(CN)(2) systems have been examined and compared with mixed-metal systems of varying metal ratios such as LaAg(0.78)Au(0.22)(CN)(2), LaAg(0.55)Au(0.45)(CN)(2), LaAg(0.33)Au(0.67)(CN)(2), and LaAg(0.19)Au(0.81)(CN)(2). We have found that these mixed-metal systems luminesce quite strongly at room temperature at an energy that is tunable and depends on the Au:Ag stoichiometric ratio. The emission energy of the mixed-metal samples lies between those of the pure Au and Ag systems. This provides evidence that the excited states responsible for this emission are delocalized over the Ag and Au centers. The strong luminescence of the mixed-metal systems at ambient temperatures is in stark contrast to the weak luminescence behavior of pure LaAu(CN)(2) and LaAg(CN)(2) samples, which makes the mixed-metal systems more viable than the pure systems for practical applications.
已对层状La[Ag(CN)₂]₃和La[Au(CN)₂]₃体系的激发态性质进行了研究，并与不同金属比例的混合金属体系进行了比较，如La[Ag(0.78)Au(0.22)(CN)₂]₃、La[Ag(0.55)Au(0.45)(CN)₂]₃、La[Ag(0.33)Au(0.67)(CN)₂]₃和La[Ag(0.19)Au(0.81)(CN)₂]₃。我们发现，这些混合金属体系在室温下能强烈发光，其能量是可调的，且取决于金与银的化学计量比。混合金属样品的发射能量介于纯金体系和纯银体系的发射能量之间。这表明，负责这种发射的激发态在银和金中心上是离域的。混合金属体系在环境温度下的强发光与纯La[Au(CN)₂]₃和La[Ag(CN)₂]₃样品的弱发光行为形成鲜明对比，这使得混合金属体系在实际应用中比纯体系更具可行性。
