Researchers from the University of Oxford have made a significant breakthrough in the field of organic light-emitting diodes (OLEDs). For the first time, they have discovered a method to electrically switch OLEDs to emit either left- or right-handed circularly polarized light. This advancement could pave the way for enhanced energy-efficient displays and more effective optical information transfer. The findings were published on November 26, 2025, in the prestigious journal Nature Photonics.
Understanding Light Polarization in OLEDs
Traditionally, the handedness of circularly polarized light emitted from OLEDs is determined by selecting a specific mirror image form of the light-emitting molecule. These forms, known as chiral molecules, can be likened to a corkscrew that twists either left or right. The challenge lies in the necessity to access both mirror image forms, which are not only complex but also costly to produce.
The research team at the University of Oxford has shown that it is possible to generate both left- and right-handed circularly polarized light using a single mirror form of the molecule. This innovative approach eliminates the need to switch materials, allowing for electrical control over the emitted light’s handedness.
The researchers achieved this by designing emitting materials that interact uniquely with circularly polarized light. By manipulating the balance of charge transport within the OLED, they can control whether the device emits light in one handedness or the other. Central to this process is an organic polymeric emitting material that self-assembles into a highly twisted structure, which is crucial for achieving the desired optical effects.
Potential Applications and Future Implications
The ability to control light polarization bears immense implications for various technologies, including low-power displays, secure communications, and advanced quantum applications. According to Professor Matthew Fuchter, lead author of the study, “Adding circular polarization allows for additional information to be encoded into the light signal. Rather than your signal being simply ‘on’ or ‘off,’ it could additionally be ‘on-and-left’ or ‘on-and-right.'”
Previous methods for controlling OLED light polarization required separating differently handed forms of the same molecule, a labor-intensive and expensive endeavor. The new technique represents a paradigm shift, making the creation of circularly polarized LEDs with controllable characteristics more feasible and scalable.
Professor Fuchter and his team hope that their insights into the relationship between molecule chirality and light chirality, often referred to as optical activity, will lead to further advancements in the fields of display technology, secure communication, and quantum innovations.
This research not only enhances our understanding of the fundamental physics of chiral organic materials but also opens up new avenues for practical applications in technology.
For further details, refer to the study titled “Electrical control of photon spin angular momentum in organic electroluminescent materials” published in Nature Photonics. The study can be accessed at DOI: 10.1038/s41566-025-01780-4.
