期刊
ORGANIC ELECTRONICS
卷 74, 期 -, 页码 13-22出版社
ELSEVIER
DOI: 10.1016/j.orgel.2019.06.041
关键词
Phosphorescent OLED; Thermally activated delayed fluorescence; Bipolar host; 1, 2, 4-Trizole; Low roll-off
资金
- US Department of Energy (USDOE) [DE-AC 02-07CH11358]
- National Natural Scientific Foundation of China [61705156, 21071108, 60976018, 61605138]
- Shanxi Provincial Key Innovative Research Team in Science and Technology [201513002-10]
- open research fund of Key Laboratory for Organic Electronics and Information Displays
- Basic Energy Sciences, Materials Science and Engineering Division, USDOE
The host in phosphrescent organic light emitting devices (PhOLEDs), showing the thermally activated delayed fluorescence (TADF) charateristic, can effectively overcome the efficiency roll-off. Herein, six bipolar compounds with donor-pi-acceptor (D-pi-A) and D-pi-A-pi-D structures have been synthesized using 1,2,4-triazole derivative (TAZ) as an acceptor and phenothiazine (PTZ), phenoxazine (PXZ), and 9, 9-dimethylacridane (DMAC) as donors. The molecular structures were confirmed by H-1 NMR, C-13 NMR and X-ray single-crystal diffractions. The large steric hindrance endows these molecules with typical TADF features, including the small singlet-triplet energy splitting (Delta E-ST) of 0.08-0.30 eV and completely spatially separate highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) electron densities. The PhOLEDs hosted by these novel TADF materials display excellent performances with low efficiency roll-off.
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