Colorful Narrow‐Band Organic Polariton Light‐emitting Diodes Based on a Single Emitter

Abstract Organic light‐emitting diodes hold promise for producing multicolor, narrowband emissions, and high‐definition displays. However, achieving a wide color gamut and strict color purity with high fidelity in line with BT.2020 standards is challenging. Here, a method is developed that incorporates organic films into a microcavity, leading to efficient organic polariton electroluminescence. The polariton OLEDs offer several advantages, such as a low turn‐on voltage, the ability to emit in six distinct narrowband colors covering blue to red, and robustness at current densities up to 118 A cm −2 . By controlling photonic components, a wide color gamut and high color purity can be achieved. Remarkably, the method enables the red‐emitting devices to overcome the challenges posed by the exciton dark state, where the oscillator strength of the exciton is negligible. This innovation has the potential to promote the realization of electrically driven organic solid‐state lasers integrated into single‐component systems for cutting‐edge display and lighting applications.