ORGANIC LIGHT-EMITTING DIODES (OLEDS) HAVE FOUND broad applications in recent commercial displays. OLED panels are attractive in high-end products, particularly in the television and mobile markets, ensuring low power consumption, high contrast, and strongly improved lifetime compared to early-generation OLEDs.1 This development was enabled by high-performing materials as well as more refined OLED stack layouts to allow for a defined charge control with low resistance.2 Merck KGaA, Darmstadt, Germany, has developed a full portfolio of materials to enable high-performance OLED stacks (Fig. 1). As OLED technology improves, the demands on the display become more complex. Materials must deliver high efficiency, low operational voltage, and long lifetime. Future materials will need to minimize lateral current leakage, improve capacitance performance, and enable simplified, stable manufacturing.
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