A Phosphanthrene Oxide Host with Close Sphere Packing for Ultralow-Voltage-Driven Efficient Blue Thermally Activated Delayed Fluorescence Diodes.
basic_science · Level V
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- Record sourced from PubMed, PMID 28833794.
- Also identified by DOI 10.1002/adma.201700553.
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Abstract
A phosphanthrene oxide host, 5,10-diphenyl-phosphanthrene 5,10-dioxide (DPDPO<sub>2</sub> A), with intra- and intermolecular hydrogen bonds achieves spheroidal cis-configuration and close sphere packing. DPDPO<sub>2</sub> A realizes effective exciton suppression and excellent and balanced carrier transporting ability, both at the same time, demonstrating favorable photoluminescence quantum yield of 84% from its blue thermally activated delayed fluorescence (TADF) dye, namely bis[4-(9,9-dimethyl-9,10-dihydroacridine) phenyl]sulfone, doped films and high electron and hole mobility at the level of 10<sup>-4</sup> and 10<sup>-5</sup> cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> , respectively. DPDPO<sub>2</sub> A endows its blue TADF devices with record-low driving voltages, e.g., turn-on voltage of 2.5 V, and the state-of-the-art efficiencies with maxima of 22.5% for external quantum efficiency and 52.9 lm W<sup>-1</sup> for power efficiency, which is the best comprehensive performance to date of ultralow-voltage-driven blue TADF diodes.