期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 5, 页码 1614-1622出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05892c
关键词
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资金
- National Basic Research Program of China [2015CB655003]
- National Natural Science Foundation of China [51803069, 21772064]
- China Postdoctoral Science Foundation [2018T110244, 2018M630319]
The development of high efficiency orange-red/red thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs) with reduced efficiency roll-off remains a huge challenge. By fusing two weak electron-withdrawing benzoyl and quinoxaline units into one molecule, a strong pi-accepting phenyl(quinoxalin-6-yl)methanone unit is introduced as an acceptor to develop three orange-red to red TADF emitters, (2-(4-(phenoxazin-10-yl)phenyl)quinoxalin-6-yl)phenylmethanone (PXZ-PQM), (2,3-bis(4-(phenoxazin-10-yl)phenyl)quinoxalin-6-yl)(phenyl)methanone (DPXZ-PQM) and (3,6-di(phenoxazin-10-yl)dibenzophenazin-11-yl)phenylmethanone (DPXZ-DPPM). By tuning the numbers of the donor and electron-withdrawing characteristics of the acceptor, the emission wavelength can be regulated from orange-red to red (592-642 nm). The rigid planar constituent moieties and highly twisted molecular structures induce high photoluminescence quantum yields of 61-88% in doped films and extremely small singlet-triplet energy splitting. The orange-red TADF-OLED using DPXZ-PQM as an emitter achieves a maximum external quantum efficiency (EQE) as high as 26.0% at 590 nm, which is among the highest EQE values reported for orange-red TADF-OLEDs with similar wavelengths. More importantly, a low efficiency roll-off is rendered with EQEs of 20.1 and 13.7% at a luminance of 100 and 1000 cd m(-2), respectively.
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