Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 20, Pages 6883-6890Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00102c
Keywords
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Funding
- National Key R&D Program of China [2016YFB0401001]
- National Natural Science Foundation of China [91833304, 21774047]
- Jilin Provincial Science and Technology Department [20180201084GX]
- Fundamental Research Funds for the Central Universities
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The simultaneous realization of high-efficiency and low-cost in fluorescent organic light-emitting diodes (OLEDs) is still a formidable challenge in the deep-red (DR)/near-infrared (NIR) region because of the intrinsic limitation of the energy-gap law and fluorescence quenching effect. Herein, three novel donor-acceptor-donor ' (D-A-D ') fluorophores, PIBz-10-PTZ, PIBz-10P-PTZ and PIBz-3-PTZ, by utilizing phenanthro[9,10-d]imidazole and phenothiazine as the donor and benzothiadiazole as the acceptor are synthesized. Owing to the unilateral steric hindrance between adjacent hydrogen atoms along the horizontal axis, PIBz-3-PTZ possesses a completely planar conformation and fully conjugated structure. PIBz-3-PTZ exhibits a strong DR emission and aggregation induced emission (AIE) property with a high photoluminescence quantum yield of 35% in neat thin films. The nondoped OLEDs achieved a maximum external quantum efficiency (EQE) of 2.02% with an emission peak at 672 nm and a brightness of up to 3403 cd m(-2). In addition, the device was able to maintain an EQE of 1.69% at a high luminance of 100 cd m(-2), with a low efficiency roll-off of 16%, suggesting that the nondoped device can keep a relatively high efficiency at very high brightness.
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