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Efficient white organic light‐emitting devices with uncomplicated architectures are fabricated employing phosphorescent platinum (II) complexes containing extended π‐conjugated cyclometalated ligands as a yellow‐light source, and fluorescent material 9, 10‐bis‐(β‐naphthyl)‐anthrene as a blue‐light source. Peak external quantum (power) efficiencies of 11.8%(18.4 lm W–1) are demonstrated (see figure).