Synthesis and properties of amorphous blue‐light‐emitting polymers with high glass‐transition temperatures

Abstract

A series of soluble poly(arylene ether)s containing the phenylphosphine oxide moiety were synthesized by the polymerization of substituted oligophenylene diols with bis(fluorophenyl)phenylphosphine oxide. These amorphous polyethers had well‐defined structures and showed blue photoluminescence combined with good thermal stability, especially when phenyl or ethoxy side groups were used. The glass‐transition temperatures increased when the size of the oligophenylene segment increased from three to five rings or when the length of the alkoxy substituents decreased. Polymers with glass‐transition temperatures up to 270 °C were obtained. The absorption and photoluminescent spectra shifted to longer wavelengths with an increase in the oligophenylene block. A redshift was also observed on photoluminescent spectra in the transition from solution to the solid state. © 2001 John Wiley & Sons, Inc. J Polym Sci Part A: Polym Chem 39: 3168–3179, 2001

Processable photonic polymers with controllable properties

“…Examination of the solution luminescence properties revealed an emission at 415 nm regardless of the side chain's length. In the solid state, a redshift to 432 nm was obtained for polymers II 13…”

“…Blue light‐emitting polymers, combining color purity and operational stability with highly efficient blue emission, are still a matter of intense research. The development of quinquephenylene segments and their incorporation thereafter into polymeric main chains was our first approach toward the preparation of a variety of blue light‐emitting polymers 12, 13, 31. To achieve highly soluble polymeric structures, appendant side groups have been used ranging from alkyl (polymers Ia ) or alkoxy (polymers Ib and Ic ) to second‐generation Fréchet‐type dendrons (polymers III ).…”

“…The development of quinquephenylene segments and their incorporation thereafter into polymeric main chains was our first approach toward the preparation of a variety of blue lightemitting polymers. 12,13,31 To achieve highly soluble polymeric structures, appendant side groups have been used ranging from alkyl (polymers Ia) or alkoxy (polymers Ib and Ic) to second-generation Fréchet-type dendrons (polymers III). With a proper selection of the side groups and the nonconjugated moieties, which can be either an aliphatic spacer or a nonlinear unit as in polymer II, soluble, high-molecular-weight polymers were obtained in all cases with glass-transition temperatures (T g 's) ranging from room temperature to 220°C.…”

“…In the solid state, a redshift to 432 nm was obtained for polymers II. 13 A more systematic luminescence study was performed for polymers III bearing two Fréchettype dendrons of the second generation as substituents, where besides the high quantum yields in solution, high quantum yields were also obtained in the solid state, providing information for the conformational behavior of these polymers in the solid state. 31 To control the emission color, other types of monomers were also synthesized and polymerized.…”

“…This particular technique combines the advantages of the oligomeric approach in molecular electronics, for example, solubility and well‐defined conjugation length, with those arising from polymers, for example, processability, good mechanical properties, and the absence of crystallization in the devices. Thus, a number of processable polymers emitting at various wavelengths have been synthesized and investigated with the above methodology 5–16…”