63‐4: Lateral‐Leakage Current Reduction in Tandem RGB OLED for Enhanced Low‐Gray‐Level Color Accuracy

Our experimental results demonstrated that optimized tandem OLED exhibits an 80% increase in efficiency and a twofold extension in lifetime relative to single OLEDs. In tandem OLEDs, the charge generation layer (CGL) facilitates the lateral leakage current (LLC) into adjacent subpixels of different colors, which degrades color purity, particularly at low luminance. To mitigate LLC, we developed an advanced CGL structure that yields a threefold reduction in color coordinate variation, thereby significantly enhancing color accuracy.