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首页> 外文期刊>Advanced functional materials >Multiplying Phosphine-Oxide Orientation to Enable Ultralow-Voltage-Driving Simple White Thermally Activated Delayed Fluorescence Diodes with Power Efficiency over 100 lm W~(?1)
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Multiplying Phosphine-Oxide Orientation to Enable Ultralow-Voltage-Driving Simple White Thermally Activated Delayed Fluorescence Diodes with Power Efficiency over 100 lm W~(?1)

机译：Multiplying Phosphine-Oxide Orientation to Enable Ultralow-Voltage-Driving Simple White Thermally Activated Delayed Fluorescence Diodes with Power Efficiency over 100 lm W~(?1)

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Thermally activated delayed fluorescence (TADF) white organic light-emittingdiodes (WOLED) hold great potential for daily lightings, but shouldovercome the current limitation in power conservation. Despite amount ofefforts on developing efficient TADF emitters, it is demonstrated here thatthe host matrix actually controls exciton formation and allocation, thereforestrongly determines power efficiency. Through multiplying P?O orientations,248DBTTPO matrix establishes “diffusion predominance” mode to supportmultidirectional carrier/exciton migration, which combines the advantagesof “recombination predominance” and “transport predominance” modes inalleviating dopant–dopant interactions and rationalizing carrier and energytransfer. 248DBTTPO matrix effectively balances carrier flux, singlet radiation,and triplet quenching suppression of TADF emitters, and exciton allocationin its complementary white TADF systems. As consequence, 248DBTTPOendows its trilayer single-emissive-layer WOLEDs with the state-of-theartexternal quantum efficiency up to 27%, ultralow driving voltages, andconsequently the record-high power efficiency of 108.6 lm W~(?1), which breaksthrough key bottleneck of TADF lighting.

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