期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 10, 页码 2528-2537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00526
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资金
- National Science Fund of China [51525304, 61890942, U1601651]
- National Key Research and Development Program of China [2017YFA0204501, 2015CB655002]
One seemingly fundamental issue for electron-transporting materials (ETMs) in organic light-emitting diodes (OLEDs) is the mutual exclusion of a high electron-transporting mobility (mu(e)) and a large molecular triplet energy for good exciton confinement. Very recently, a trade-off was realized by adopting polycyclic aromatic hydrocarbon (PAH) derivatives as bipolar ETMs. Though the intrinsic low triplet energy of PAH moieties, good exciton confinement abilities are realized by manipulating the peripheral groups, integrating large mu(e) values and long-term stabilities simultaneously. The resulting state-of-the-art OLED performances manifest the bright future of such ETMs. This Perspective summarizes the theoretical and experimental work relating to the relationship between the molecular structure of PAH-type ETMs and their electronic properties, focusing on charge transfer and exciton confinement abilities; the Perspective concludes by providing a vision of future developments in this field.
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