44‐2: Optogenetic Manipulation of Neurons Using Organic Light‐Emitting Diodes

We developed tandem‐structured blue and yellow OLEDs optimized for optogenetics, achieving peak optical power densities of ~3.1 mW/mm ² and ~3.8 mW/mm ² , respectively. The emission spectra were matched to the activation spectra of opsins like ChR2 and Arch, enabling effective neuronal activation and inhibition. With a custom‐made 64‐channel MEA, we demonstrated precise temporal correlations between OLED stimulation and neuronal responses. These results establish OLEDs as promising light sources for optogenetic applications.