Journal
ADVANCED MATERIALS
Volume 29, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700553
Keywords
blue emission; driving voltage; phosphine oxide hosts; sphere packing; thermally activated delayed fluorescence
Categories
Funding
- Ministry of Education (China)
- NSFC [21672056, 51373050, 61605042, 21602048]
- Science and Technology Bureau of Heilongjiang Province [ZD201402, JC2015002]
- Education Bureau of Heilongjiang Province [2014CJHB005]
- Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China [141012]
- Harbin Science and Technology Bureau [2015RAYXJ008]
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A phosphanthrene oxide host, 5,10-diphenyl-phosphanthrene 5,10-dioxide (DPDPO(2)A), with intra- and intermolecular hydrogen bonds achieves spheroidal cis-configuration and close sphere packing. DPDPO(2)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(-4) and 10(-5) cm(2) V-1 s(-1), respectively. DPDPO(2)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-1 for power efficiency, which is the best comprehensive performance to date of ultralow-voltage-driven blue TADF diodes.
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