Optical Properties and EL Characteristics of Poly[(disilanylene)oligophenylenes]

Abstract

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.