稀土碘化物的合成及其发光性质的研究

本文将纯稀土金属与碘化汞在加温下合成了钪、镝、铒和铥的碘化物。并用DTA方法测定了NaI-ScI_3,NaI-DyI_3,NaI-ErI_3和NaI-TmI_3二元体系的相图,它们都是简单的有低共熔点的二元体系,但是后面三个体系在固相有相变,可能是形成了不稳定的化合物。文中还制造了填充不同比例的碘化钠和稀土金属碘化物混合物的金属卤化物灯,将它们的发光特性与汞灯进行了比较。碘化钠和稀土金属碘化物的加入能明显地改善灯的色温,显色性和光效。

SYNTHESIS AND LUMINESCENT PROPERTIES OF RARE EARTH IODIDES

Anhydrous metal iodides of Sc, Dy, Er and Tm were prepared by the reaction of metallic rare earths with mercuric iodide at elevated temperature. Phase diagrams of the binary systems NaI-REI_3 (RE= Sc, Dy, Er and Tin) were obtained by DTA technique. All they are simple binary eutectic system. For RE=Dy, Er and Tm, the phase transition of the corresponding systems occured below eutectic temperature, indicating the possible existence of some unstable compounds. Metal halide lamps filled with the mixture of sodium iodide and rare earth iodides have been made and compared with the mercury arc lamp. It was shown that addition of sodium iodide and rare earth iodides improves the color temperature, color rendering indices and efficacy of the lamps.