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A three‐color warm‐white organic light‐emitting diode employing an efficient phosphor–phosphor type host–guest emitting system achieves efficiencies of 27.3% for external quantum efficiency and 74.5 lm W–1 for power efficiency at a luminance of 1000 cd m–2, which maintained the high levels of 24.3% and 45.8 lm W−1 at 10 000 cd m−2, with a stable color‐rendering index of 86–87.
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