Polarized Phthalocyanine Electroluminescence Diodes Prepared on Polysilane Films Treated with Polarized UV Light

ABSTRACT

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  = Φ_⊥/Φ_| was ca. 2 and 2.1 for phthalocyanine film prepared from solution and by vacuum evaporation, respectively.

Keywords:

• hydroxyaluminium phthalocyaninesulfonate
• photoalignment
• polarized electroluminescence
• poly[methyl(phenyl)silylene]

Acknowledgments

The financial support by grants No. FT-TA/036 from the Ministry of Industry and Trade of the Czech Republic and No. CZE03/016 from the Ministry of the Education, Youth and Sports Czech Republic are gratefully appreciated.