期刊
MOLECULES
卷 27, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/molecules27165181
关键词
OLEDs; polycyclic fused amide; electron acceptor unit; blue emission
资金
- National Key R&D Program of China [2020YFA0714600]
- National Natural Science Foundation of China [51625301, 91833304, 51903096, 51861145301]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019B1515120023]
- Guangdong Provincial Department of Science and Technology [2016B090906003, 2016TX03C175]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
Two novel polycyclic fused amide units were combined with donors to generate four blue emitters with higher thermal stability and photoluminescence quantum yields. The intermolecular interactions in the materials effectively inhibited molecular rotation and allowed for blue-shifted emissions. A highly efficient sky-blue OLED device was achieved using these materials.
Aromatic imide derivatives play a critical role in boosting the electroluminescent (EL) performance of organic light-emitting diodes (OLEDs). However, the majority of aromatic imide-based materials are limited to long wavelength emission OLEDs rather than blue emissions due to their strong electron-withdrawing characteristics. Herein, two novel polycyclic fused amide units were reported as electron acceptor to be combined with either a tetramethylcarbazole or acridine donor via a phenyl linker to generate four conventional fluorescence blue emitters of BBI-4MeCz, BBI-DMAC, BSQ-4MeCz and BSQ-DMAC for the first time. BSQ-4MeCz and BSQ-DMAC based on a BSQ unit exhibited higher thermal stability and photoluminescence quantum yields than BBI-4MeCz and BBI-DMAC based on a BBI unit due to their more planar acceptor structure. The intermolecular interactions that exist in the BSQ series materials effectively inhibit the molecular rotation and configuration relaxation, and thus allow for blue-shifted emissions. Blue OLED devices were constructed with the developed materials as emitters, and the effects of both the structure of the polycyclic fused amide acceptor and the electron donor on the EL performance were clarified. Consequently, a sky-blue OLED device based on BSQ-DMAC was created, with a high maximum external quantum efficiency of 4.94% and a maximum luminance of 7761 cd m(-2).
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