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By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5cdA −1 which slightly shift to 34.2 and 40.0cdA −1 at 1000cdm −2 are demonstrated...
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