Optical Properties and El Characteristics of Poly[(disilanylene)oligophenylenes]
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Band-gap energies of poly[(disilanylene)terphenylene] (PDSiTP) and poly[(disilanylene)quaterphenylene] (PDSiQP) films have been evaluated as 3.5 eV and 3.3 eV, respectively, which are similar to those of p-terphenyl and p-quaterphenyl films. Contrary to poly(methylpropylsilane), large Stokes shift of photoluminescence (PL) is observed in these polymers, which is similar to the cases of p-terphenyl and p-quaterphenyl. Blue electroluminescence (EL) has been observed in diodes of MgAg/PDSiTP/ITO and MgAg/PDSiQP/ITO structures with peaks at 440 nm and 443 nm, respectively. These polymers are much more stable than poly(methylpropylsilane) under ultraviolet light irradiation.
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