Journal
CHEMICAL ENGINEERING JOURNAL
Volume 438, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135571
Keywords
Organic light-emitting diodes; Thermally activated delayed fluorescence; Efficiency roll-off; Phenazine
Categories
Funding
- National Natural Science Foundation of China [52130308, 51903252, 51803124]
- Shenzhen Science and Technology Program [KQTD2017033011010704 6]
- Shenzhen Technology and Innovation Commission [JCYJ20180507182244027]
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Two new thermally activated delayed fluorescence (TADF) molecules were constructed by connecting novel rigid polycyclic phenazine-derived donors with oxygen-bridged boron acceptor. The resulting emitters exhibited fast reverse intersystem crossing rates and high photoluminescence quantum yields, leading to high-performance orange OLEDs with extremely low efficiency roll-off.
Two new thermally activated delayed fluorescence (TADF) molecules, tBuInPz-BO and InPz-BO, are constructed via connecting novel rigid polycyclic phenazine-derived donors with oxygen-bridged boron acceptor. Both emitters exhibit fast reverse intersystem crossing rates and high photoluminescence quantum yields, owing to the high molecular structural rigidity. As a result, the orange organic light-emitting diode (OLED) fabricated with tBuInPz-BO shows a maximum external quantum efficiency (EQE(max)) of 22.0% with the electroluminescence peak at 585 nm. Moreover, the device displays extremely low efficiency roll-off. At high luminance of 1000 and 10000 cd/m(2), the EQE values still maintain a high level of 20.2% and 14.8%, respectively, achieving state-of-the-art electroluminescence performance among TADF-based orange OLEDs. This work reveals the great potential of the new phenazine-derived donors for constructing highly efficient TADF emitters.
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