Alternating‐Current‐Driven Color‐Tunable Organic Light‐Emitting Triodes

Abstract Exploring multifunctional, miniaturized light‐emitting devices with well‐controlled operation is deemed vital to meet the increasing demands of full‐color displays and lighting systems. Nevertheless, complicated architectures, low performance, and poor operational control remain daunting challenges in the realization of smart devices. Here, an alternating‐current‐driven organic light‐emitting triode (AC‐OLETr) is reported with simple yet versatile architecture that emits light with precise control over the color and intensity. The fabricated AC‐OLETr devices are driven and regulated by a three‐phase AC supply, making them highly suitable for implementation in state‐of‐the‐art electric systems. A coplanar two‐phase AC drives a pair of light‐emitting units of different colors, while a third‐phase AC tunes the luminescence intensity ratio of the former two units through changes in its phase difference. Furthermore, interdigitated electrodes are employed to achieve effective control over the light emission, extending from yellow, through white, to the blue region. The proposed configuration offers a simplistic approach to realize color‐tunable light emission and holds great potential for full‐color displays and next‐generation solid‐state lighting.