期刊
CHEMICAL ENGINEERING JOURNAL
卷 451, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138919
关键词
Thermally activated delayed fluorescence; Aggregation -induced delayed fluorescence; Bipolar carrier transport; Top -emitting organic light -emitting diode; White organic light -emitting diode
In this study, two sky-blue luminescent materials, mCP-BP-DMAC and DCB-BP-DMAC, were synthesized and characterized. They showed excellent thermal and electrochemical stabilities, strong aggregation-induced delayed fluorescence, and high efficiency in OLEDs. These materials have great potential for applications in display and lighting devices.
The development of blue luminescent materials plays a crucial role in the industry of organic light-emitting diodes (OLEDs). Herein, two sky-blue luminescent materials (mCP-BP-DMAC and DCB-BP-DMAC) comprised of electron donors of 9-(3-(9H-carbazol-9-yl)phenyl, 9-(4-(9H-carbazol-9-yl)phenyl and 9,9-dimethyl-9,10-dihy-droacridine and electron acceptor of benzoyl are synthesized and characterized. They exhibit excellent thermal and electrochemical stabilities, strong aggregation-induced delayed fluorescence and bipolar carrier transport ability, and behavior efficiently in nondoped and doped bottom-emitting OLEDs with high external quantum efficiencies (eta exts) of up to 26.6% and small efficiency roll-offs. Efficient top-emitting OLEDs employing mCP-BP-DMAC and DCB-BP-DMAC as emitters are also achieved, providing sky-blue lights with high color purity and impressive eta exts over 30%. In addition, hybrid white OLEDs with stable emission color and high color rendering index are fabricated based on a single emissive layer consisting of orange-red phosphorescent Ir(MDQ)2acac dopant and sky-blue mCP-BP-DMAC and DCB-BP-DMAC hosts, furnishing excellent eta exts of up to 24.1% and small efficiency roll-offs. These results demonstrate mCP-BP-DMAC and DCB-BP-DMAC are outstanding luminescent and host materials with great application potentials in display and lighting devices.
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