期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 17, 页码 5769-5776出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00718h
关键词
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资金
- National Key Basic Research and Development Program of China [2016YFB0401002, 2016YFB0400700]
- National Natural Science Foundation of China [61520106012, 61722404, 51873138]
- 333 program [BRA2019061]
- Collaborative Innovation Center of Suzhou Nano Science Technology
For the development of solution-processed organic light-emitting diodes (OLEDs), it is highly desirable yet challenging to realize solution-processable non-doped thermally activated delayed fluorescence (TADF) emitters due to their high efficiency and excellent compatibility to the wet methods. Herein, two pairs of blue TADF isomers are designed and synthesized with a hetero-donor configuration for the realization of high photoluminescent quantum yield. The incorporation of two tert-butyl groups in the molecules can effectively increase the molecular solubility and reduce the aggregation-caused self-quenching of excitons in neat films by inhibiting the intramolecular vibrational relaxation and the intermolecular pi-pi stacking. Solution-processed non-doped OLEDs are achieved with these blue TADF emitters, exhibiting the record-high external quantum efficiencies (EQE) of 25.8%. Furthermore, an all-TADF white OLED with an EQE of 27.3% is also achieved by employing a single emitting layer with the blue TADF emitter as a host for an orange-red TADF dopant.
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