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Strong colorfast blue photo‐ and electroluminescence is reported for random high molecular weight poly(fluorene‐co‐anthracene)s, prepared via the nickel‐mediated copolymerization of the corresponding aryl dibromides. The incorporation of anthracene into the main chain is demonstrated to completely suppress excimer formation—a major drawback of many planar π‐systems. Poly(fluorene)s are attractive as active components of organic light‐emitting diodes (LEDs) because of their thermal and chemical stability and exceptionally high fluorescence quantum yields.