Eiji Shikoh, an assistant professor at the Japan Advanced Institute of Science and Technology, developed an OLED device that emits circularly polarized light in the visible light range.
It is a basic technology to enable 3D representation on OLED and electronic paper displays. To produce the circularly polarized light in the visible light range, the spin state during the light emission process is controlled by injecting a spin-polarized carrier from the ferromagnetic negative electrode into the emission layer.
In general, OLED devices use a nonmagnetic material such as aluminum (Al) for their negative electrodes. But the new technology uses a ferromagnetic material such as iron (Fe) for the negative electrode in order to inject spin-polarized electrons from the ferromagnetic negative electrode into the emission layer.
The research was conducted as part of the Industrial Technology Research Grant Program promoted by Japan’s New Energy and Industrial Technology Development Organization (NEDO)
