Abstract
orange red TADF emitters consist of rigid donor and acceptor moieties exhibit excellent device efficiencies. However, achieving high color purity in orange red region is hindered due to strong charge-transfer characteristics of donor–acceptor-type emitters. To overcome such issues, multi-resonance type emitters are proposed, and it shows high color purity along with good efficiencies in orange red organic light emitting diodes. As an alternative to the conventional system, hyper-fluorescence organic light emitting diodes show great attention towards future pure red TADF development.
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