Experimental study of a chemical reaction between LiF and Al

摘要

The interaction between LiF and Al has been studied by x-ray photoemission spectroscopy and high-resolution electron energy loss spectroscopy (HREELS). At room temperature, reaction between LiF and Al already occurred in the presence of Alq_(3), as revealed by the 0.25 eV shift of the Li 1s peak relative to the F 1 s peak. Upon heating the LiF-coated Al substrate above 70℃, reaction between LiF and Al also occurred in the absence of Alq_(3), suggested by the emergence of a peak 0.85 eV below the original Li 1 s peak. The relatively large shift of 0.85 eV indicated that the emergent Li state possessed a metallic character. The reaction between LiF and Al upon heating was also corroborated by HREELS measurements. Heating of the Al/LiF/polymer device enhanced its electroluminescence, and may be associated with free Li atoms.