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Efficient deep blue fluorescent OLEDs with ultra-low efficiency roll-off based on 4H-1,2,4-triazole cored D-A and D-A-D type emitters

White OledSolid-state LightingNew Lighting TechnologyUltra-low Efficiency Roll-offLuminescence PropertyThermally Activated Delayed FluorescenceOptoelectronicsD-a-d Type Emitters