Polarized electroluminescence from bilayer structures

The photoalignment ability of poly[methyl(phenyl)silylene] (PMPSi) films makes it possible to use them as hole‐transporting substrates for the preparation of organic oriented films. A PMPSi layer prepared by spin coating was irradiated, after drying, with linearly polarized UV light. Then, water‐soluble hydroxyaluminium phthalocyaninesulfonate [Al(OH)Pc(SO3Na)1−2] was deposited by casting. The cell ITO/PMPSi/Al(OH)Pc(SO3Na)1−2/Al showed non‐linear current‐voltage characteristics. For applied voltages higher than 10 V, polarized electroluminescence was observed. Its spectral characteristic consisted of two peaks with maxima at about 320 and 700 nm; their polarized anisotropies REL= Φ∥ / Φ⟂ were ca. 15 and 0.5, respectively.