Polarized phthalocyanine electroluminescence diodes prepared on polysilane films treated with polarized UV light

Photoalignment ability of poly[methyl(phenyl)silylene] (PMPSi) films makes possible to use them as hole transporting substrates for the preparation of organic oriented films. PMPSi layer prepared by spin coating was after drying irradiated with linearly polarized UV light. Then, water soluble hydroxyaluminium phthalocyaninesulfonate sodium salt [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 20 V, a polarized electroluminescence was observed. Its polarizing anisotropy R-EL = phi(perpendicular to)/phi(parallel to) was ca. 2 and 2.1 for phthalocyanine film prepared from solution and by vacuum evaporation, respectively.