Chiral Polymer Hosts for Circularly Polarized Phosphorescence Emission
발표자
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초록
내용
Circularly polarized luminescence (CPL) is of great utility for electroluminescence applications, as it significantly reduces reflection. In order to demonstrate CP-electroluminescence, it is imperative to develop CPL-emitting layers (CPL-EMLs). To address this challenge, we designed and synthesized chiral polymer hosts for CPL-EMLs. The copolymers were synthesized through conventional free-radical polymerization using 9-ethyl-3-vinylcarbazole and (R)-9-(1-phenylpropan-2-yl)-3-vinylcarbazole as achiral and chiral monomers, respectively. We anticipated an asymmetric polymerization by the Sergeants-and-Soldiers principle exerted by the chiral monomer. The copolymers were analyzed employing various physical and photophysical techniques. We demonstrated the utility of our chiral polymers by observing CPL from spincoated films doped with [Pt(dfppy)(acac)] (dfppy = 2-(2,4difluorophenyl)pyridinato; acac = acetylacetonate), an achiral phosphorescent dopant.