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This research investigates the impact of deuteration on the operational lifetime of blue organic light‐emitting diodes (OLEDs). Our study focuses on the kinetic isotope effect (KIE) and how it enhances device lifetime. Specifically, we examine the effects of deuteration on OLEDs with emitters based on common polycyclic aromatic hydrocarbons by deuterating anthracene‐based host materials. Our findings...