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Induction of circularly polarized electroluminescence from an achiral light-emitting polymer via a chiral small-molecule dopant.

ABSTRACT: By simply doping the conventional light-emitting polymer F8BT with a helically chiral aromatic molecule, it is shown that substantial levels of CP-electroluminescence can be generated directly. Both photoluminescent and electroluminescent emission from the polymer are observed to become circularly polarized, with the sign of the CP emission directly determined by the handedness of the dopant.

SUBMITTER: Yang Y

PROVIDER: S-EPMC3659407 | biostudies-literature | 2013 May

REPOSITORIES: biostudies-literature

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Induction of circularly polarized electroluminescence from an achiral light-emitting polymer via a chiral small-molecule dopant.

Yang Ying Y da Costa Rosenildo Correa RC Smilgies Detlef-M DM Campbell Alasdair J AJ Fuchter Matthew J MJ

Advanced materials (Deerfield Beach, Fla.) 20130402 18

By simply doping the conventional light-emitting polymer F8BT with a helically chiral aromatic molecule, it is shown that substantial levels of CP-electroluminescence can be generated directly. Both photoluminescent and electroluminescent emission from the polymer are observed to become circularly polarized, with the sign of the CP emission directly determined by the handedness of the dopant. ...[more]

PMID: 23554220

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Project description:Polymer electroluminescence devices producing circularly polarized luminescence (CP PLEDs) have valuable photonic applications. The fabrication of a CP PLED requires a polymer host that provides the appropriate chiral environment around the emitting dopant. However, chemical strategies for the design of chiral polymer hosts remain underdeveloped. We have developed new polymer hosts for CP PLED applications. These polymers were prepared through a free-radical polymerization of 3-vinylcarbazole with a chiral N-alkyl unit. This chiral unit forces the carbazole repeat units to form mutually helical half-sandwich conformers with preferred (P)-helical sense along the polymer main chain. Electronic circular dichroism measurements demonstrate the occurrence of chirality transfer from chiral monomers to achiral monomers during chain growth. The (P)-helical-sense-enriched polymer interacts diastereoselectively with an enantiomeric pair of new phosphorescent (R)- and (S)-dopants. The magnitude of the Kuhn dissymmetry factor (g abs) for the (P)-helically-enriched polymer film doped with the (R)-dopant was found to be one order of magnitude higher than that of the film doped with the (S)-dopant. Photoluminescence dissymmetry factors (g PL) of the order of 10-3 were recorded for the doped films, but the magnitude of diastereomeric enhancement decreased to that of g abs. The chiral polymer host permits faster energy transfer to the phosphorescent dopants than the achiral polymer host. Our photophysical and morphological investigations indicate that the acceleration in the chiral polymer host is due to its longer Förster radius and improved compatibility with the dopants. Finally, multilayer CP PLEDs were fabricated and evaluated. Devices based on the chiral polymer host with the (R)- and (S)-dopants exhibit electroluminescence dissymmetry factors (g EL) of 1.09 × 10-4 and -1.02 × 10-4 at a wavelength of 540 nm, respectively. Although challenges remain in the development of polymer hosts for CP PLEDs, our research demonstrates that chiroptical performances can be amplified by using chiral polymer hosts.

Dataset Information

Induction of circularly polarized electroluminescence from an achiral light-emitting polymer via a chiral small-molecule dopant.

Publications

Induction of circularly polarized electroluminescence from an achiral light-emitting polymer via a chiral small-molecule dopant.

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