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The electronic structure of co-evaporated LiF and tris (8-hydroxyquinoline) aluminum (Alq) films with different weight ratios have been investigated with ultraviolet and X-ray photoemission spectroscopy (UPS and XPS). The results indicate that pristine LiF has only a small n-doping effect. However, Alq films doped with freshly crushed LiF powder source show a much larger shift in the frontier orbital,...
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