Publication date: 22nd July 2026
Conjugated chiral materials can emit circularly-polarised (CP) light within thin films and optoelectronic devices. CP-light is relevant to a range of technologies, including displays, optical communication, and emerging quantum information. Chiral light-emitting polymers have gained increasing attention due to their capability to combine strong chiroptical responses with the optoelectronic characteristics typical of organic conjugated materials, making them attractive for circularly polarised organic light-emitting diodes (CP-OLEDs).
Although circularly polarised electroluminescence can be achieved from intrinsically chiral organic chromophores, chiral polymers and polymer-based thin films can overcome several intrinsic limitations of small molecules: the magnitude of the chiroptical response can be amplified to achieve dissymmetry factors that are unusually large for organic emitters. Blending chiral additives, such as aza[6]-helicene, into conjugated polymer thin films has proven to be an effective route to high-performance CP-OLEDs, enabling high efficiencies alongside strong CP-light emission. Notably, device studies revealed behaviours that could not be explained by treating the emissive layer as a conventional chiral emitter.[1]
This talk will give an overview of how charge mobility and charge carrier flow direction have a crucial role in controlling the magnitude and sign of CP-light, together with the role of the chiral additive. We will demonstrate how manipulating and managing the flow of charge carriers allows for the electrical control of CP-Light emission properties in a chiral light-emitting polymer, achieved without changing the intrinsic chirality of the film or the employed device architecture. This approach offers a route toward CP-OLEDs where polarisation characteristics can be tuned and optimised through device-relevant parameters and not solely relying on the chemical design of the emitters.[2] In a complementary direction, this talk will also showcase the potential of energy transfer mechanisms from a chiral polymer host to amplify the dissymmetry of conventional chiral emitters. These concepts will be discussed together with their application to CP-OLEDs,[3] and their extension to address the limitations of small molecule CP-light emitters in the red region of the visible spectrum.
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