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A new class of dithiosquarylium dyes (DTSQ) has been synthesized by the reaction of squarylium dye (SQ) with Lawesson's reagent or P 4 S 10 . The λ max , of DTSQ dyes undergoes a bathochromic shift of about 25 nm compared with corresponding SQ dyes. The visible absorption spectra of DTSQ dyes are well accounted for by Pariser-Parr-Pople Molecular Orbital (PPP-MO)...
A new dithiosquarylium (DTSQ) dye was examined as an electron transport material in organic EL devices. We fabricated the EL cell with poly(p-phenylene vinylene) (PPV) as the emission layer. DTSQ was found to be useful as a novel electron transport material. The EL device with DTSQ as the electron transport layer was more efficient than that with only the PPV layer.
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