磷光
轨道能级差
接受者
磷光有机发光二极管
光化学
有机发光二极管
吩恶嗪
分子轨道
荧光
位阻效应
单重态
化学
电子受体
分子
材料科学
吩噻嗪
立体化学
有机化学
原子物理学
激发态
物理
量子力学
药理学
图层(电子)
凝聚态物理
医学
作者
Huixia Xu,Yingwei Zhao,Jing Zhang,Di Zhang,Yanqin Miao,J. Shinar,Ruth Shinar,Hua Wang,Bingshe Xu
标识
DOI:10.1016/j.orgel.2019.06.041
摘要
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-π-acceptor (D-π-A) and D-π-A-π-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 1H NMR, 13C 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 (ΔEST) 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI