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Double-doped host–guest LEEC containing 4 as the blue/green host component, 22 as an orange-emitting electron transporting material and 44 as the red dopant. Device: ITO/PEDOT:PSS/4 (79.85 wt %), 22 (0.05 wt %), 44 (0.10 wt %), [BMIM][PF6] (20.00 wt %)/Al, entry 5
